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Chapter 39: Reading, Altering, and Debugging Code

Learn Grade 4 mathematics with very-beginner explanations, original worked examples, practice, reasoning, and review.

Grade 4Beginner Friendly10 Examples Per Topic30 Q&APractice + Review
Estimated reading time0% read
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Chapter Overview

This chapter teaches Reading, Altering, and Debugging Code in original, simple language with step-by-step reasoning, worked examples, practice exercises, common mistakes, and review questions.

39.1 Reading existing code

Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules. Work one step at a time, use a model or number sentence when useful, and check whether the answer is reasonable.

Beginner Explanation

First identify what is given and what must be found. Then choose a strategy, show the steps clearly, and check the final answer.

10 Worked Examples with Answers

Worked Example 1

Problem: Create a simple Grade 4 example about Reading existing code using the numbers 19 and 16.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Reading existing code.

Worked Example 2

Problem: Create a simple Grade 4 example about Reading existing code using the numbers 2 and 5.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Reading existing code.

Worked Example 3

Problem: Create a simple Grade 4 example about Reading existing code using the numbers 5 and 13.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Reading existing code.

Worked Example 4

Problem: Create a simple Grade 4 example about Reading existing code using the numbers 15 and 3.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Reading existing code.

Worked Example 5

Problem: Create a simple Grade 4 example about Reading existing code using the numbers 19 and 16.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Reading existing code.

Worked Example 6

Problem: Create a simple Grade 4 example about Reading existing code using the numbers 9 and 12.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Reading existing code.

Worked Example 7

Problem: Create a simple Grade 4 example about Reading existing code using the numbers 5 and 8.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Reading existing code.

Worked Example 8

Problem: Create a simple Grade 4 example about Reading existing code using the numbers 20 and 16.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Reading existing code.

Worked Example 9

Problem: Create a simple Grade 4 example about Reading existing code using the numbers 10 and 11.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Reading existing code.

Worked Example 10

Problem: Create a simple Grade 4 example about Reading existing code using the numbers 18 and 14.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Reading existing code.

Practice Exercise

Create and solve one new example of Reading existing code. Show the steps and explain how you checked it.

Common Mistake

Do not rush into a calculation before understanding the question. Check place values, labels, units, and whether your answer fits the situation.

39.2 Predicting an outcome before running code

Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules. Work one step at a time, use a model or number sentence when useful, and check whether the answer is reasonable.

Beginner Explanation

First identify what is given and what must be found. Then choose a strategy, show the steps clearly, and check the final answer.

10 Worked Examples with Answers

Worked Example 1

Problem: Create a simple Grade 4 example about Predicting an outcome before running code using the numbers 2 and 14.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Predicting an outcome before running code.

Worked Example 2

Problem: Create a simple Grade 4 example about Predicting an outcome before running code using the numbers 20 and 7.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Predicting an outcome before running code.

Worked Example 3

Problem: Create a simple Grade 4 example about Predicting an outcome before running code using the numbers 12 and 12.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Predicting an outcome before running code.

Worked Example 4

Problem: Create a simple Grade 4 example about Predicting an outcome before running code using the numbers 6 and 18.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Predicting an outcome before running code.

Worked Example 5

Problem: Create a simple Grade 4 example about Predicting an outcome before running code using the numbers 14 and 17.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Predicting an outcome before running code.

Worked Example 6

Problem: Create a simple Grade 4 example about Predicting an outcome before running code using the numbers 9 and 12.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Predicting an outcome before running code.

Worked Example 7

Problem: Create a simple Grade 4 example about Predicting an outcome before running code using the numbers 15 and 19.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Predicting an outcome before running code.

Worked Example 8

Problem: Create a simple Grade 4 example about Predicting an outcome before running code using the numbers 7 and 14.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Predicting an outcome before running code.

Worked Example 9

Problem: Create a simple Grade 4 example about Predicting an outcome before running code using the numbers 16 and 6.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Predicting an outcome before running code.

Worked Example 10

Problem: Create a simple Grade 4 example about Predicting an outcome before running code using the numbers 16 and 16.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Predicting an outcome before running code.

Practice Exercise

Create and solve one new example of Predicting an outcome before running code. Show the steps and explain how you checked it.

Common Mistake

Do not rush into a calculation before understanding the question. Check place values, labels, units, and whether your answer fits the situation.

39.3 Changing one instruction

Changing one instruction is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense. Work one step at a time, use a model or number sentence when useful, and check whether the answer is reasonable.

Beginner Explanation

First identify what is given and what must be found. Then choose a strategy, show the steps clearly, and check the final answer.

10 Worked Examples with Answers

Worked Example 1

Problem: Create a simple Grade 4 example about Changing one instruction using the numbers 11 and 3.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing one instruction.

Worked Example 2

Problem: Create a simple Grade 4 example about Changing one instruction using the numbers 19 and 16.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing one instruction.

Worked Example 3

Problem: Create a simple Grade 4 example about Changing one instruction using the numbers 15 and 12.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing one instruction.

Worked Example 4

Problem: Create a simple Grade 4 example about Changing one instruction using the numbers 15 and 9.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing one instruction.

Worked Example 5

Problem: Create a simple Grade 4 example about Changing one instruction using the numbers 6 and 14.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing one instruction.

Worked Example 6

Problem: Create a simple Grade 4 example about Changing one instruction using the numbers 10 and 15.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing one instruction.

Worked Example 7

Problem: Create a simple Grade 4 example about Changing one instruction using the numbers 4 and 4.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing one instruction.

Worked Example 8

Problem: Create a simple Grade 4 example about Changing one instruction using the numbers 11 and 4.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing one instruction.

Worked Example 9

Problem: Create a simple Grade 4 example about Changing one instruction using the numbers 2 and 11.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing one instruction.

Worked Example 10

Problem: Create a simple Grade 4 example about Changing one instruction using the numbers 17 and 3.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing one instruction.

Practice Exercise

Create and solve one new example of Changing one instruction. Show the steps and explain how you checked it.

Common Mistake

Do not rush into a calculation before understanding the question. Check place values, labels, units, and whether your answer fits the situation.

39.4 Changing a loop count

Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules. Work one step at a time, use a model or number sentence when useful, and check whether the answer is reasonable.

Beginner Explanation

First identify what is given and what must be found. Then choose a strategy, show the steps clearly, and check the final answer.

10 Worked Examples with Answers

Worked Example 1

Problem: Create a simple Grade 4 example about Changing a loop count using the numbers 4 and 20.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing a loop count.

Worked Example 2

Problem: Create a simple Grade 4 example about Changing a loop count using the numbers 14 and 8.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing a loop count.

Worked Example 3

Problem: Create a simple Grade 4 example about Changing a loop count using the numbers 12 and 10.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing a loop count.

Worked Example 4

Problem: Create a simple Grade 4 example about Changing a loop count using the numbers 20 and 3.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing a loop count.

Worked Example 5

Problem: Create a simple Grade 4 example about Changing a loop count using the numbers 7 and 18.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing a loop count.

Worked Example 6

Problem: Create a simple Grade 4 example about Changing a loop count using the numbers 17 and 2.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing a loop count.

Worked Example 7

Problem: Create a simple Grade 4 example about Changing a loop count using the numbers 7 and 6.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing a loop count.

Worked Example 8

Problem: Create a simple Grade 4 example about Changing a loop count using the numbers 10 and 14.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing a loop count.

Worked Example 9

Problem: Create a simple Grade 4 example about Changing a loop count using the numbers 2 and 11.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing a loop count.

Worked Example 10

Problem: Create a simple Grade 4 example about Changing a loop count using the numbers 10 and 14.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing a loop count.

Practice Exercise

Create and solve one new example of Changing a loop count. Show the steps and explain how you checked it.

Common Mistake

Do not rush into a calculation before understanding the question. Check place values, labels, units, and whether your answer fits the situation.

39.5 Changing movement distance

Changing movement distance is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense. Work one step at a time, use a model or number sentence when useful, and check whether the answer is reasonable.

Beginner Explanation

First identify what is given and what must be found. Then choose a strategy, show the steps clearly, and check the final answer.

10 Worked Examples with Answers

Worked Example 1

Problem: Create a simple Grade 4 example about Changing movement distance using the numbers 12 and 18.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing movement distance.

Worked Example 2

Problem: Create a simple Grade 4 example about Changing movement distance using the numbers 2 and 12.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing movement distance.

Worked Example 3

Problem: Create a simple Grade 4 example about Changing movement distance using the numbers 14 and 12.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing movement distance.

Worked Example 4

Problem: Create a simple Grade 4 example about Changing movement distance using the numbers 3 and 16.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing movement distance.

Worked Example 5

Problem: Create a simple Grade 4 example about Changing movement distance using the numbers 15 and 12.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing movement distance.

Worked Example 6

Problem: Create a simple Grade 4 example about Changing movement distance using the numbers 3 and 18.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing movement distance.

Worked Example 7

Problem: Create a simple Grade 4 example about Changing movement distance using the numbers 12 and 10.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing movement distance.

Worked Example 8

Problem: Create a simple Grade 4 example about Changing movement distance using the numbers 11 and 2.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing movement distance.

Worked Example 9

Problem: Create a simple Grade 4 example about Changing movement distance using the numbers 17 and 7.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing movement distance.

Worked Example 10

Problem: Create a simple Grade 4 example about Changing movement distance using the numbers 18 and 9.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing movement distance.

Practice Exercise

Create and solve one new example of Changing movement distance. Show the steps and explain how you checked it.

Common Mistake

Do not rush into a calculation before understanding the question. Check place values, labels, units, and whether your answer fits the situation.

39.6 Changing direction

Changing direction is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense. Work one step at a time, use a model or number sentence when useful, and check whether the answer is reasonable.

Beginner Explanation

First identify what is given and what must be found. Then choose a strategy, show the steps clearly, and check the final answer.

10 Worked Examples with Answers

Worked Example 1

Problem: Create a simple Grade 4 example about Changing direction using the numbers 16 and 14.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing direction.

Worked Example 2

Problem: Create a simple Grade 4 example about Changing direction using the numbers 3 and 13.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing direction.

Worked Example 3

Problem: Create a simple Grade 4 example about Changing direction using the numbers 6 and 2.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing direction.

Worked Example 4

Problem: Create a simple Grade 4 example about Changing direction using the numbers 20 and 5.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing direction.

Worked Example 5

Problem: Create a simple Grade 4 example about Changing direction using the numbers 13 and 5.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing direction.

Worked Example 6

Problem: Create a simple Grade 4 example about Changing direction using the numbers 10 and 19.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing direction.

Worked Example 7

Problem: Create a simple Grade 4 example about Changing direction using the numbers 10 and 17.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing direction.

Worked Example 8

Problem: Create a simple Grade 4 example about Changing direction using the numbers 15 and 15.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing direction.

Worked Example 9

Problem: Create a simple Grade 4 example about Changing direction using the numbers 20 and 5.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing direction.

Worked Example 10

Problem: Create a simple Grade 4 example about Changing direction using the numbers 19 and 19.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Changing direction.

Practice Exercise

Create and solve one new example of Changing direction. Show the steps and explain how you checked it.

Common Mistake

Do not rush into a calculation before understanding the question. Check place values, labels, units, and whether your answer fits the situation.

39.7 Finding a bug

Finding a bug is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense. Work one step at a time, use a model or number sentence when useful, and check whether the answer is reasonable.

Beginner Explanation

First identify what is given and what must be found. Then choose a strategy, show the steps clearly, and check the final answer.

10 Worked Examples with Answers

Worked Example 1

Problem: Create a simple Grade 4 example about Finding a bug using the numbers 4 and 18.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Finding a bug.

Worked Example 2

Problem: Create a simple Grade 4 example about Finding a bug using the numbers 12 and 12.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Finding a bug.

Worked Example 3

Problem: Create a simple Grade 4 example about Finding a bug using the numbers 11 and 13.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Finding a bug.

Worked Example 4

Problem: Create a simple Grade 4 example about Finding a bug using the numbers 15 and 4.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Finding a bug.

Worked Example 5

Problem: Create a simple Grade 4 example about Finding a bug using the numbers 7 and 2.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Finding a bug.

Worked Example 6

Problem: Create a simple Grade 4 example about Finding a bug using the numbers 14 and 13.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Finding a bug.

Worked Example 7

Problem: Create a simple Grade 4 example about Finding a bug using the numbers 12 and 2.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Finding a bug.

Worked Example 8

Problem: Create a simple Grade 4 example about Finding a bug using the numbers 20 and 10.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Finding a bug.

Worked Example 9

Problem: Create a simple Grade 4 example about Finding a bug using the numbers 16 and 8.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Finding a bug.

Worked Example 10

Problem: Create a simple Grade 4 example about Finding a bug using the numbers 4 and 10.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Finding a bug.

Practice Exercise

Create and solve one new example of Finding a bug. Show the steps and explain how you checked it.

Common Mistake

Do not rush into a calculation before understanding the question. Check place values, labels, units, and whether your answer fits the situation.

39.8 Correcting a bug

Correcting a bug is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense. Work one step at a time, use a model or number sentence when useful, and check whether the answer is reasonable.

Beginner Explanation

First identify what is given and what must be found. Then choose a strategy, show the steps clearly, and check the final answer.

10 Worked Examples with Answers

Worked Example 1

Problem: Create a simple Grade 4 example about Correcting a bug using the numbers 3 and 20.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Correcting a bug.

Worked Example 2

Problem: Create a simple Grade 4 example about Correcting a bug using the numbers 3 and 8.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Correcting a bug.

Worked Example 3

Problem: Create a simple Grade 4 example about Correcting a bug using the numbers 11 and 9.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Correcting a bug.

Worked Example 4

Problem: Create a simple Grade 4 example about Correcting a bug using the numbers 16 and 9.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Correcting a bug.

Worked Example 5

Problem: Create a simple Grade 4 example about Correcting a bug using the numbers 17 and 4.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Correcting a bug.

Worked Example 6

Problem: Create a simple Grade 4 example about Correcting a bug using the numbers 10 and 18.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Correcting a bug.

Worked Example 7

Problem: Create a simple Grade 4 example about Correcting a bug using the numbers 13 and 18.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Correcting a bug.

Worked Example 8

Problem: Create a simple Grade 4 example about Correcting a bug using the numbers 6 and 13.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Correcting a bug.

Worked Example 9

Problem: Create a simple Grade 4 example about Correcting a bug using the numbers 18 and 16.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Correcting a bug.

Worked Example 10

Problem: Create a simple Grade 4 example about Correcting a bug using the numbers 17 and 13.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Correcting a bug.

Practice Exercise

Create and solve one new example of Correcting a bug. Show the steps and explain how you checked it.

Common Mistake

Do not rush into a calculation before understanding the question. Check place values, labels, units, and whether your answer fits the situation.

39.9 Simplifying repeated code

Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules. Work one step at a time, use a model or number sentence when useful, and check whether the answer is reasonable.

Beginner Explanation

First identify what is given and what must be found. Then choose a strategy, show the steps clearly, and check the final answer.

10 Worked Examples with Answers

Worked Example 1

Problem: Create a simple Grade 4 example about Simplifying repeated code using the numbers 5 and 13.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Simplifying repeated code.

Worked Example 2

Problem: Create a simple Grade 4 example about Simplifying repeated code using the numbers 17 and 18.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Simplifying repeated code.

Worked Example 3

Problem: Create a simple Grade 4 example about Simplifying repeated code using the numbers 8 and 18.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Simplifying repeated code.

Worked Example 4

Problem: Create a simple Grade 4 example about Simplifying repeated code using the numbers 7 and 8.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Simplifying repeated code.

Worked Example 5

Problem: Create a simple Grade 4 example about Simplifying repeated code using the numbers 4 and 2.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Simplifying repeated code.

Worked Example 6

Problem: Create a simple Grade 4 example about Simplifying repeated code using the numbers 7 and 17.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Simplifying repeated code.

Worked Example 7

Problem: Create a simple Grade 4 example about Simplifying repeated code using the numbers 13 and 17.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Simplifying repeated code.

Worked Example 8

Problem: Create a simple Grade 4 example about Simplifying repeated code using the numbers 10 and 4.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Simplifying repeated code.

Worked Example 9

Problem: Create a simple Grade 4 example about Simplifying repeated code using the numbers 13 and 20.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Simplifying repeated code.

Worked Example 10

Problem: Create a simple Grade 4 example about Simplifying repeated code using the numbers 16 and 17.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Simplifying repeated code.

Practice Exercise

Create and solve one new example of Simplifying repeated code. Show the steps and explain how you checked it.

Common Mistake

Do not rush into a calculation before understanding the question. Check place values, labels, units, and whether your answer fits the situation.

39.10 Adapting code to a new design

Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules. Work one step at a time, use a model or number sentence when useful, and check whether the answer is reasonable.

Beginner Explanation

First identify what is given and what must be found. Then choose a strategy, show the steps clearly, and check the final answer.

10 Worked Examples with Answers

Worked Example 1

Problem: Create a simple Grade 4 example about Adapting code to a new design using the numbers 4 and 12.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Adapting code to a new design.

Worked Example 2

Problem: Create a simple Grade 4 example about Adapting code to a new design using the numbers 11 and 20.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Adapting code to a new design.

Worked Example 3

Problem: Create a simple Grade 4 example about Adapting code to a new design using the numbers 20 and 9.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Adapting code to a new design.

Worked Example 4

Problem: Create a simple Grade 4 example about Adapting code to a new design using the numbers 8 and 7.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Adapting code to a new design.

Worked Example 5

Problem: Create a simple Grade 4 example about Adapting code to a new design using the numbers 7 and 14.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Adapting code to a new design.

Worked Example 6

Problem: Create a simple Grade 4 example about Adapting code to a new design using the numbers 6 and 14.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Adapting code to a new design.

Worked Example 7

Problem: Create a simple Grade 4 example about Adapting code to a new design using the numbers 15 and 12.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Adapting code to a new design.

Worked Example 8

Problem: Create a simple Grade 4 example about Adapting code to a new design using the numbers 20 and 13.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Adapting code to a new design.

Worked Example 9

Problem: Create a simple Grade 4 example about Adapting code to a new design using the numbers 12 and 3.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Adapting code to a new design.

Worked Example 10

Problem: Create a simple Grade 4 example about Adapting code to a new design using the numbers 5 and 20.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Adapting code to a new design.

Practice Exercise

Create and solve one new example of Adapting code to a new design. Show the steps and explain how you checked it.

Common Mistake

Do not rush into a calculation before understanding the question. Check place values, labels, units, and whether your answer fits the situation.

39.11 Comparing original and changed output

Comparing original and changed output is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense. Work one step at a time, use a model or number sentence when useful, and check whether the answer is reasonable.

Beginner Explanation

First identify what is given and what must be found. Then choose a strategy, show the steps clearly, and check the final answer.

10 Worked Examples with Answers

Worked Example 1

Problem: Create a simple Grade 4 example about Comparing original and changed output using the numbers 6 and 2.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Comparing original and changed output.

Worked Example 2

Problem: Create a simple Grade 4 example about Comparing original and changed output using the numbers 9 and 20.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Comparing original and changed output.

Worked Example 3

Problem: Create a simple Grade 4 example about Comparing original and changed output using the numbers 17 and 12.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Comparing original and changed output.

Worked Example 4

Problem: Create a simple Grade 4 example about Comparing original and changed output using the numbers 15 and 4.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Comparing original and changed output.

Worked Example 5

Problem: Create a simple Grade 4 example about Comparing original and changed output using the numbers 10 and 3.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Comparing original and changed output.

Worked Example 6

Problem: Create a simple Grade 4 example about Comparing original and changed output using the numbers 2 and 10.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Comparing original and changed output.

Worked Example 7

Problem: Create a simple Grade 4 example about Comparing original and changed output using the numbers 16 and 9.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Comparing original and changed output.

Worked Example 8

Problem: Create a simple Grade 4 example about Comparing original and changed output using the numbers 6 and 5.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Comparing original and changed output.

Worked Example 9

Problem: Create a simple Grade 4 example about Comparing original and changed output using the numbers 13 and 17.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Comparing original and changed output.

Worked Example 10

Problem: Create a simple Grade 4 example about Comparing original and changed output using the numbers 3 and 16.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Comparing original and changed output.

Practice Exercise

Create and solve one new example of Comparing original and changed output. Show the steps and explain how you checked it.

Common Mistake

Do not rush into a calculation before understanding the question. Check place values, labels, units, and whether your answer fits the situation.

39.12 Explaining the effect of a code change

Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules. Work one step at a time, use a model or number sentence when useful, and check whether the answer is reasonable.

Beginner Explanation

First identify what is given and what must be found. Then choose a strategy, show the steps clearly, and check the final answer.

10 Worked Examples with Answers

Worked Example 1

Problem: Create a simple Grade 4 example about Explaining the effect of a code change using the numbers 19 and 15.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Explaining the effect of a code change.

Worked Example 2

Problem: Create a simple Grade 4 example about Explaining the effect of a code change using the numbers 15 and 2.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Explaining the effect of a code change.

Worked Example 3

Problem: Create a simple Grade 4 example about Explaining the effect of a code change using the numbers 13 and 16.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Explaining the effect of a code change.

Worked Example 4

Problem: Create a simple Grade 4 example about Explaining the effect of a code change using the numbers 9 and 11.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Explaining the effect of a code change.

Worked Example 5

Problem: Create a simple Grade 4 example about Explaining the effect of a code change using the numbers 9 and 18.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Explaining the effect of a code change.

Worked Example 6

Problem: Create a simple Grade 4 example about Explaining the effect of a code change using the numbers 7 and 9.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Explaining the effect of a code change.

Worked Example 7

Problem: Create a simple Grade 4 example about Explaining the effect of a code change using the numbers 6 and 3.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Explaining the effect of a code change.

Worked Example 8

Problem: Create a simple Grade 4 example about Explaining the effect of a code change using the numbers 16 and 18.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Explaining the effect of a code change.

Worked Example 9

Problem: Create a simple Grade 4 example about Explaining the effect of a code change using the numbers 4 and 6.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Explaining the effect of a code change.

Worked Example 10

Problem: Create a simple Grade 4 example about Explaining the effect of a code change using the numbers 11 and 5.

  1. Identify what the topic means.
  2. Use the numbers in a way that follows the rule.
  3. Check that the result or representation makes sense.

Very beginner explanation: Meaning comes first; the numbers should illustrate the concept clearly.

Answer: A correct example that demonstrates Explaining the effect of a code change.

Practice Exercise

Create and solve one new example of Explaining the effect of a code change. Show the steps and explain how you checked it.

Common Mistake

Do not rush into a calculation before understanding the question. Check place values, labels, units, and whether your answer fits the situation.

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30 Review Questions and Answers

Q1. What is important to understand about Reading existing code?

Answer: Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules.

Q2. What is important to understand about Predicting an outcome before running code?

Answer: Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules.

Q3. What is important to understand about Changing one instruction?

Answer: Changing one instruction is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense.

Q4. What is important to understand about Changing a loop count?

Answer: Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules.

Q5. What is important to understand about Changing movement distance?

Answer: Changing movement distance is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense.

Q6. What is important to understand about Changing direction?

Answer: Changing direction is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense.

Q7. What is important to understand about Finding a bug?

Answer: Finding a bug is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense.

Q8. What is important to understand about Correcting a bug?

Answer: Correcting a bug is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense.

Q9. What is important to understand about Simplifying repeated code?

Answer: Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules.

Q10. What is important to understand about Adapting code to a new design?

Answer: Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules.

Q11. What is important to understand about Comparing original and changed output?

Answer: Comparing original and changed output is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense.

Q12. What is important to understand about Explaining the effect of a code change?

Answer: Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules.

Q13. How would you explain Reading existing code?

Answer: Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules.

Q14. How would you explain Predicting an outcome before running code?

Answer: Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules.

Q15. How would you explain Changing one instruction?

Answer: Changing one instruction is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense.

Q16. How would you explain Changing a loop count?

Answer: Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules.

Q17. How would you explain Changing movement distance?

Answer: Changing movement distance is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense.

Q18. How would you explain Changing direction?

Answer: Changing direction is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense.

Q19. How would you explain Finding a bug?

Answer: Finding a bug is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense.

Q20. How would you explain Correcting a bug?

Answer: Correcting a bug is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense.

Q21. How would you explain Simplifying repeated code?

Answer: Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules.

Q22. How would you explain Adapting code to a new design?

Answer: Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules.

Q23. How would you explain Comparing original and changed output?

Answer: Comparing original and changed output is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense.

Q24. How would you explain Explaining the effect of a code change?

Answer: Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules.

Q25. What should a beginner check when working with Reading existing code?

Answer: Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules.

Q26. What should a beginner check when working with Predicting an outcome before running code?

Answer: Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules.

Q27. What should a beginner check when working with Changing one instruction?

Answer: Changing one instruction is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense.

Q28. What should a beginner check when working with Changing a loop count?

Answer: Coding gives precise instructions. Mathematical code can represent movement, shapes, patterns, repeated steps, and problem-solving rules.

Q29. What should a beginner check when working with Changing movement distance?

Answer: Changing movement distance is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense.

Q30. What should a beginner check when working with Changing direction?

Answer: Changing direction is an important Grade 4 mathematics idea in Reading, Altering, and Debugging Code. Understand the meaning first, then use a clear representation or strategy and check whether the answer makes sense.