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Chapter 24: Addition and Subtraction Relationships

Learn Grade 2 mathematics with very-beginner explanations, original worked examples, practice, reasoning, and review.

Grade 2Very Beginner Friendly10 Examples Per Topic30 Q&APractice + Review
Estimated reading time0% read
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Chapter Overview

This chapter teaches Addition and Subtraction Relationships with simple explanations, visual thinking, worked examples, practice, and review.

24.1 Addition and subtraction are related

Addition combines quantities. Counting on, making ten, drawings, and place value can help. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Find 39 + 53.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 92

Worked Example 2

Problem: Find 16 + 6.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 22

Worked Example 3

Problem: Find 58 + 8.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 66

Worked Example 4

Problem: Find 69 + 25.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 94

Worked Example 5

Problem: Find 32 + 26.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 58

Worked Example 6

Problem: Find 54 + 22.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 76

Worked Example 7

Problem: Find 23 + 10.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 33

Worked Example 8

Problem: Find 44 + 65.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 109

Worked Example 9

Problem: Find 12 + 53.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 65

Worked Example 10

Problem: Find 27 + 45.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 72

24.2 Fact families

Fact families is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Use 17 and 10 to make a simple example about Fact families.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Fact families.

Worked Example 2

Problem: Use 20 and 6 to make a simple example about Fact families.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Fact families.

Worked Example 3

Problem: Use 7 and 9 to make a simple example about Fact families.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Fact families.

Worked Example 4

Problem: Use 4 and 9 to make a simple example about Fact families.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Fact families.

Worked Example 5

Problem: Use 18 and 5 to make a simple example about Fact families.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Fact families.

Worked Example 6

Problem: Use 4 and 12 to make a simple example about Fact families.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Fact families.

Worked Example 7

Problem: Use 18 and 16 to make a simple example about Fact families.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Fact families.

Worked Example 8

Problem: Use 11 and 18 to make a simple example about Fact families.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Fact families.

Worked Example 9

Problem: Use 19 and 4 to make a simple example about Fact families.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Fact families.

Worked Example 10

Problem: Use 6 and 4 to make a simple example about Fact families.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Fact families.

24.3 Inverse operations

Inverse operations is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Use 1 and 16 to make a simple example about Inverse operations.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Inverse operations.

Worked Example 2

Problem: Use 7 and 3 to make a simple example about Inverse operations.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Inverse operations.

Worked Example 3

Problem: Use 13 and 1 to make a simple example about Inverse operations.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Inverse operations.

Worked Example 4

Problem: Use 8 and 4 to make a simple example about Inverse operations.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Inverse operations.

Worked Example 5

Problem: Use 5 and 7 to make a simple example about Inverse operations.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Inverse operations.

Worked Example 6

Problem: Use 20 and 8 to make a simple example about Inverse operations.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Inverse operations.

Worked Example 7

Problem: Use 6 and 2 to make a simple example about Inverse operations.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Inverse operations.

Worked Example 8

Problem: Use 7 and 6 to make a simple example about Inverse operations.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Inverse operations.

Worked Example 9

Problem: Use 15 and 10 to make a simple example about Inverse operations.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Inverse operations.

Worked Example 10

Problem: Use 4 and 17 to make a simple example about Inverse operations.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Inverse operations.

24.4 Writing related addition facts

Addition combines quantities. Counting on, making ten, drawings, and place value can help. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Find 44 + 18.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 62

Worked Example 2

Problem: Find 55 + 21.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 76

Worked Example 3

Problem: Find 44 + 65.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 109

Worked Example 4

Problem: Find 50 + 29.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 79

Worked Example 5

Problem: Find 5 + 38.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 43

Worked Example 6

Problem: Find 27 + 43.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 70

Worked Example 7

Problem: Find 49 + 23.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 72

Worked Example 8

Problem: Find 28 + 33.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 61

Worked Example 9

Problem: Find 40 + 55.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 95

Worked Example 10

Problem: Find 70 + 68.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 138

24.5 Writing related subtraction facts

Subtraction can mean taking away, finding a difference, or finding a missing part. Addition can check the answer. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Find 94 − 26.

  1. Start with the larger number.
  2. Take away or count up.
  3. Check with addition.

Very beginner explanation: Subtraction finds what remains or the difference.

Answer: 68

Worked Example 2

Problem: Find 43 − 6.

  1. Start with the larger number.
  2. Take away or count up.
  3. Check with addition.

Very beginner explanation: Subtraction finds what remains or the difference.

Answer: 37

Worked Example 3

Problem: Find 64 − 29.

  1. Start with the larger number.
  2. Take away or count up.
  3. Check with addition.

Very beginner explanation: Subtraction finds what remains or the difference.

Answer: 35

Worked Example 4

Problem: Find 46 − 28.

  1. Start with the larger number.
  2. Take away or count up.
  3. Check with addition.

Very beginner explanation: Subtraction finds what remains or the difference.

Answer: 18

Worked Example 5

Problem: Find 124 − 100.

  1. Start with the larger number.
  2. Take away or count up.
  3. Check with addition.

Very beginner explanation: Subtraction finds what remains or the difference.

Answer: 24

Worked Example 6

Problem: Find 118 − 113.

  1. Start with the larger number.
  2. Take away or count up.
  3. Check with addition.

Very beginner explanation: Subtraction finds what remains or the difference.

Answer: 5

Worked Example 7

Problem: Find 109 − 11.

  1. Start with the larger number.
  2. Take away or count up.
  3. Check with addition.

Very beginner explanation: Subtraction finds what remains or the difference.

Answer: 98

Worked Example 8

Problem: Find 112 − 76.

  1. Start with the larger number.
  2. Take away or count up.
  3. Check with addition.

Very beginner explanation: Subtraction finds what remains or the difference.

Answer: 36

Worked Example 9

Problem: Find 46 − 30.

  1. Start with the larger number.
  2. Take away or count up.
  3. Check with addition.

Very beginner explanation: Subtraction finds what remains or the difference.

Answer: 16

Worked Example 10

Problem: Find 124 − 121.

  1. Start with the larger number.
  2. Take away or count up.
  3. Check with addition.

Very beginner explanation: Subtraction finds what remains or the difference.

Answer: 3

24.6 Finding a missing addend

Addition combines quantities. Counting on, making ten, drawings, and place value can help. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Find 38 + 22.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 60

Worked Example 2

Problem: Find 65 + 68.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 133

Worked Example 3

Problem: Find 18 + 21.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 39

Worked Example 4

Problem: Find 56 + 13.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 69

Worked Example 5

Problem: Find 61 + 16.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 77

Worked Example 6

Problem: Find 58 + 38.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 96

Worked Example 7

Problem: Find 37 + 20.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 57

Worked Example 8

Problem: Find 47 + 63.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 110

Worked Example 9

Problem: Find 52 + 12.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 64

Worked Example 10

Problem: Find 5 + 27.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 32

24.7 Finding a missing part

Finding a missing part is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Use 5 and 7 to make a simple example about Finding a missing part.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Finding a missing part.

Worked Example 2

Problem: Use 17 and 3 to make a simple example about Finding a missing part.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Finding a missing part.

Worked Example 3

Problem: Use 14 and 10 to make a simple example about Finding a missing part.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Finding a missing part.

Worked Example 4

Problem: Use 1 and 4 to make a simple example about Finding a missing part.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Finding a missing part.

Worked Example 5

Problem: Use 16 and 3 to make a simple example about Finding a missing part.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Finding a missing part.

Worked Example 6

Problem: Use 7 and 8 to make a simple example about Finding a missing part.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Finding a missing part.

Worked Example 7

Problem: Use 4 and 1 to make a simple example about Finding a missing part.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Finding a missing part.

Worked Example 8

Problem: Use 11 and 19 to make a simple example about Finding a missing part.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Finding a missing part.

Worked Example 9

Problem: Use 16 and 14 to make a simple example about Finding a missing part.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Finding a missing part.

Worked Example 10

Problem: Use 6 and 10 to make a simple example about Finding a missing part.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Finding a missing part.

24.8 Finding an unknown start

Equality means both sides have the same value. An unknown is the number needed to make a statement true. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Find □: □ + 5 = 19.

  1. Find the missing part.
  2. Use subtraction if helpful.

Very beginner explanation: The unknown must make both sides equal.

Answer: 14

Worked Example 2

Problem: Find □: □ + 6 = 15.

  1. Find the missing part.
  2. Use subtraction if helpful.

Very beginner explanation: The unknown must make both sides equal.

Answer: 9

Worked Example 3

Problem: Find □: □ + 2 = 5.

  1. Find the missing part.
  2. Use subtraction if helpful.

Very beginner explanation: The unknown must make both sides equal.

Answer: 3

Worked Example 4

Problem: Find □: □ + 8 = 20.

  1. Find the missing part.
  2. Use subtraction if helpful.

Very beginner explanation: The unknown must make both sides equal.

Answer: 12

Worked Example 5

Problem: Find □: □ + 10 = 18.

  1. Find the missing part.
  2. Use subtraction if helpful.

Very beginner explanation: The unknown must make both sides equal.

Answer: 8

Worked Example 6

Problem: Find □: □ + 3 = 9.

  1. Find the missing part.
  2. Use subtraction if helpful.

Very beginner explanation: The unknown must make both sides equal.

Answer: 6

Worked Example 7

Problem: Find □: □ + 6 = 20.

  1. Find the missing part.
  2. Use subtraction if helpful.

Very beginner explanation: The unknown must make both sides equal.

Answer: 14

Worked Example 8

Problem: Find □: □ + 9 = 11.

  1. Find the missing part.
  2. Use subtraction if helpful.

Very beginner explanation: The unknown must make both sides equal.

Answer: 2

Worked Example 9

Problem: Find □: □ + 6 = 21.

  1. Find the missing part.
  2. Use subtraction if helpful.

Very beginner explanation: The unknown must make both sides equal.

Answer: 15

Worked Example 10

Problem: Find □: □ + 9 = 16.

  1. Find the missing part.
  2. Use subtraction if helpful.

Very beginner explanation: The unknown must make both sides equal.

Answer: 7

24.9 Checking addition with subtraction

Addition combines quantities. Counting on, making ten, drawings, and place value can help. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Find 16 + 51.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 67

Worked Example 2

Problem: Find 9 + 14.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 23

Worked Example 3

Problem: Find 51 + 12.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 63

Worked Example 4

Problem: Find 62 + 2.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 64

Worked Example 5

Problem: Find 22 + 62.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 84

Worked Example 6

Problem: Find 41 + 21.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 62

Worked Example 7

Problem: Find 42 + 17.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 59

Worked Example 8

Problem: Find 40 + 24.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 64

Worked Example 9

Problem: Find 52 + 41.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 93

Worked Example 10

Problem: Find 27 + 61.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 88

24.10 Checking subtraction with addition

Addition combines quantities. Counting on, making ten, drawings, and place value can help. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Find 8 + 31.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 39

Worked Example 2

Problem: Find 4 + 11.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 15

Worked Example 3

Problem: Find 25 + 54.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 79

Worked Example 4

Problem: Find 36 + 70.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 106

Worked Example 5

Problem: Find 27 + 7.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 34

Worked Example 6

Problem: Find 38 + 28.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 66

Worked Example 7

Problem: Find 62 + 11.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 73

Worked Example 8

Problem: Find 65 + 37.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 102

Worked Example 9

Problem: Find 24 + 38.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 62

Worked Example 10

Problem: Find 31 + 41.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 72

24.11 Choosing addition or subtraction

Addition combines quantities. Counting on, making ten, drawings, and place value can help. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Find 36 + 49.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 85

Worked Example 2

Problem: Find 42 + 23.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 65

Worked Example 3

Problem: Find 18 + 16.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 34

Worked Example 4

Problem: Find 2 + 11.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 13

Worked Example 5

Problem: Find 34 + 12.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 46

Worked Example 6

Problem: Find 58 + 36.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 94

Worked Example 7

Problem: Find 3 + 26.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 29

Worked Example 8

Problem: Find 8 + 52.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 60

Worked Example 9

Problem: Find 24 + 47.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 71

Worked Example 10

Problem: Find 60 + 39.

  1. Start with the larger number.
  2. Add tens or make a ten if helpful.
  3. Add the remaining ones.

Very beginner explanation: Addition combines quantities.

Answer: 99

24.12 Real-life relationship problems

Real-life relationship problems is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Use 19 and 15 to make a simple example about Real-life relationship problems.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Real-life relationship problems.

Worked Example 2

Problem: Use 7 and 15 to make a simple example about Real-life relationship problems.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Real-life relationship problems.

Worked Example 3

Problem: Use 2 and 4 to make a simple example about Real-life relationship problems.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Real-life relationship problems.

Worked Example 4

Problem: Use 5 and 19 to make a simple example about Real-life relationship problems.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Real-life relationship problems.

Worked Example 5

Problem: Use 5 and 4 to make a simple example about Real-life relationship problems.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Real-life relationship problems.

Worked Example 6

Problem: Use 18 and 4 to make a simple example about Real-life relationship problems.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Real-life relationship problems.

Worked Example 7

Problem: Use 12 and 11 to make a simple example about Real-life relationship problems.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Real-life relationship problems.

Worked Example 8

Problem: Use 12 and 5 to make a simple example about Real-life relationship problems.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Real-life relationship problems.

Worked Example 9

Problem: Use 20 and 4 to make a simple example about Real-life relationship problems.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Real-life relationship problems.

Worked Example 10

Problem: Use 13 and 9 to make a simple example about Real-life relationship problems.

  1. Recall the topic meaning.
  2. Use objects, a drawing, or a number sentence.
  3. Check that the example matches the idea.

Very beginner explanation: Simple models make Grade 2 ideas easier to understand.

Answer: A correct Grade 2 example of Real-life relationship problems.

30 Review Questions and Answers

Q1. What should a Grade 2 learner understand about Addition and subtraction are related?

Answer: Addition combines quantities. Counting on, making ten, drawings, and place value can help.

Q2. What should a Grade 2 learner understand about Fact families?

Answer: Fact families is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

Q3. What should a Grade 2 learner understand about Inverse operations?

Answer: Inverse operations is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

Q4. What should a Grade 2 learner understand about Writing related addition facts?

Answer: Addition combines quantities. Counting on, making ten, drawings, and place value can help.

Q5. What should a Grade 2 learner understand about Writing related subtraction facts?

Answer: Subtraction can mean taking away, finding a difference, or finding a missing part. Addition can check the answer.

Q6. What should a Grade 2 learner understand about Finding a missing addend?

Answer: Addition combines quantities. Counting on, making ten, drawings, and place value can help.

Q7. What should a Grade 2 learner understand about Finding a missing part?

Answer: Finding a missing part is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

Q8. What should a Grade 2 learner understand about Finding an unknown start?

Answer: Equality means both sides have the same value. An unknown is the number needed to make a statement true.

Q9. What should a Grade 2 learner understand about Checking addition with subtraction?

Answer: Addition combines quantities. Counting on, making ten, drawings, and place value can help.

Q10. What should a Grade 2 learner understand about Checking subtraction with addition?

Answer: Addition combines quantities. Counting on, making ten, drawings, and place value can help.

Q11. What should a Grade 2 learner understand about Choosing addition or subtraction?

Answer: Addition combines quantities. Counting on, making ten, drawings, and place value can help.

Q12. What should a Grade 2 learner understand about Real-life relationship problems?

Answer: Real-life relationship problems is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

Q13. What should a Grade 2 learner understand about Addition and subtraction are related?

Answer: Addition combines quantities. Counting on, making ten, drawings, and place value can help.

Q14. What should a Grade 2 learner understand about Fact families?

Answer: Fact families is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

Q15. What should a Grade 2 learner understand about Inverse operations?

Answer: Inverse operations is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

Q16. What should a Grade 2 learner understand about Writing related addition facts?

Answer: Addition combines quantities. Counting on, making ten, drawings, and place value can help.

Q17. What should a Grade 2 learner understand about Writing related subtraction facts?

Answer: Subtraction can mean taking away, finding a difference, or finding a missing part. Addition can check the answer.

Q18. What should a Grade 2 learner understand about Finding a missing addend?

Answer: Addition combines quantities. Counting on, making ten, drawings, and place value can help.

Q19. What should a Grade 2 learner understand about Finding a missing part?

Answer: Finding a missing part is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

Q20. What should a Grade 2 learner understand about Finding an unknown start?

Answer: Equality means both sides have the same value. An unknown is the number needed to make a statement true.

Q21. What should a Grade 2 learner understand about Checking addition with subtraction?

Answer: Addition combines quantities. Counting on, making ten, drawings, and place value can help.

Q22. What should a Grade 2 learner understand about Checking subtraction with addition?

Answer: Addition combines quantities. Counting on, making ten, drawings, and place value can help.

Q23. What should a Grade 2 learner understand about Choosing addition or subtraction?

Answer: Addition combines quantities. Counting on, making ten, drawings, and place value can help.

Q24. What should a Grade 2 learner understand about Real-life relationship problems?

Answer: Real-life relationship problems is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

Q25. What should a Grade 2 learner understand about Addition and subtraction are related?

Answer: Addition combines quantities. Counting on, making ten, drawings, and place value can help.

Q26. What should a Grade 2 learner understand about Fact families?

Answer: Fact families is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

Q27. What should a Grade 2 learner understand about Inverse operations?

Answer: Inverse operations is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

Q28. What should a Grade 2 learner understand about Writing related addition facts?

Answer: Addition combines quantities. Counting on, making ten, drawings, and place value can help.

Q29. What should a Grade 2 learner understand about Writing related subtraction facts?

Answer: Subtraction can mean taking away, finding a difference, or finding a missing part. Addition can check the answer.

Q30. What should a Grade 2 learner understand about Finding a missing addend?

Answer: Addition combines quantities. Counting on, making ten, drawings, and place value can help.