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Chapter 5: Numbers 41 to 50

Learn Grade 1 mathematics from very beginner explanations through worked examples, practice, reasoning, and review.

Grade 1Beginner Friendly10 Examples Per Topic30 Q&APractice + Review
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Chapter Overview

This chapter teaches Numbers 41 to 50 with simple language, step-by-step reasoning, and original worked examples. Math words are explained in simple Grade 1 language.

Key Technical Terms

  • Counting from 41 to 50 (a Grade 1 idea used in this chapter)
  • Reading numbers 41 to 50 (a Grade 1 idea used in this chapter)
  • Writing numbers 41 to 50 (a Grade 1 idea used in this chapter)
  • Making tens and ones (a Grade 1 idea used in this chapter)
  • Numbers before and after (a Grade 1 idea used in this chapter)
  • Finding missing numbers (a Grade 1 idea used in this chapter)
  • Counting on within 50 (a Grade 1 idea used in this chapter)
  • Counting back within 50 (a Grade 1 idea used in this chapter)
  • Numbers 41 to 50 in context (a Grade 1 idea used in this chapter)
  • Numbers 41 to 50 review (a Grade 1 idea used in this chapter)

How to Learn This Chapter

Read or listen to the explanation, use objects or pictures when helpful, follow one step at a time, and try the example again before checking the answer.

5.1 Counting from 41 to 50

Counting from 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Beginner Note

Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.

10 Worked Examples with Answers and Very-Beginner Explanations

Worked Example 1

Problem: What does Counting from 41 to 50 mean?

  1. Say the topic in simple words.
  2. Use objects, fingers, a drawing, or a number example.
  3. Tell what you notice.

Very beginner explanation: Counting from 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Counting from 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Worked Example 2

Problem: Show one small example of Counting from 41 to 50.

  1. Choose small numbers or a simple shape/object.
  2. Make a model or drawing.
  3. Describe what the model shows.

Very beginner explanation: Counting from 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: A correct small model or drawing can show the meaning of Counting from 41 to 50.

Worked Example 3

Problem: Which tool could help with Counting from 41 to 50?

  1. Think about counters, fingers, a ten frame, number line, picture, table, or real object.
  2. Choose the tool that makes the idea easiest to see.

Very beginner explanation: Counting from 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Use a simple tool that lets you see and check the quantities or shapes.

Worked Example 4

Problem: How can you check your work in Counting from 41 to 50?

  1. Look at the objects, drawing, or numbers again.
  2. Count or compare one more time.
  3. Make sure the answer matches the question.

Very beginner explanation: Counting from 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Check by recounting, comparing, or using a second simple model.

Worked Example 5

Problem: Where might you use Counting from 41 to 50 in everyday life?

  1. Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
  2. Choose one situation.
  3. Explain how the math helps.

Very beginner explanation: Counting from 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Counting from 41 to 50 can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.

Worked Example 6

Problem: Count to 6. What number comes just before 6?

  1. Count forward until 6.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 5

Worked Example 7

Problem: Count to 12. What number comes just before 12?

  1. Count forward until 12.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 11

Worked Example 8

Problem: Count to 19. What number comes just before 19?

  1. Count forward until 19.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 18

Worked Example 9

Problem: Count to 27. What number comes just before 27?

  1. Count forward until 27.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 26

Worked Example 10

Problem: Count to 44. What number comes just before 44?

  1. Count forward until 44.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 43

Practice Exercise

Create one small question about Counting from 41 to 50. Show it with objects, a picture, or numbers, then check by counting or comparing again.

5.2 Reading numbers 41 to 50

Reading numbers 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Beginner Note

Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.

10 Worked Examples with Answers and Very-Beginner Explanations

Worked Example 1

Problem: What does Reading numbers 41 to 50 mean?

  1. Say the topic in simple words.
  2. Use objects, fingers, a drawing, or a number example.
  3. Tell what you notice.

Very beginner explanation: Reading numbers 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Reading numbers 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Worked Example 2

Problem: Show one small example of Reading numbers 41 to 50.

  1. Choose small numbers or a simple shape/object.
  2. Make a model or drawing.
  3. Describe what the model shows.

Very beginner explanation: Reading numbers 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: A correct small model or drawing can show the meaning of Reading numbers 41 to 50.

Worked Example 3

Problem: Which tool could help with Reading numbers 41 to 50?

  1. Think about counters, fingers, a ten frame, number line, picture, table, or real object.
  2. Choose the tool that makes the idea easiest to see.

Very beginner explanation: Reading numbers 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Use a simple tool that lets you see and check the quantities or shapes.

Worked Example 4

Problem: How can you check your work in Reading numbers 41 to 50?

  1. Look at the objects, drawing, or numbers again.
  2. Count or compare one more time.
  3. Make sure the answer matches the question.

Very beginner explanation: Reading numbers 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Check by recounting, comparing, or using a second simple model.

Worked Example 5

Problem: Where might you use Reading numbers 41 to 50 in everyday life?

  1. Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
  2. Choose one situation.
  3. Explain how the math helps.

Very beginner explanation: Reading numbers 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Reading numbers 41 to 50 can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.

Worked Example 6

Problem: Count to 6. What number comes just before 6?

  1. Count forward until 6.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 5

Worked Example 7

Problem: Count to 12. What number comes just before 12?

  1. Count forward until 12.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 11

Worked Example 8

Problem: Count to 19. What number comes just before 19?

  1. Count forward until 19.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 18

Worked Example 9

Problem: Count to 27. What number comes just before 27?

  1. Count forward until 27.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 26

Worked Example 10

Problem: Count to 44. What number comes just before 44?

  1. Count forward until 44.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 43

Practice Exercise

Create one small question about Reading numbers 41 to 50. Show it with objects, a picture, or numbers, then check by counting or comparing again.

5.3 Writing numbers 41 to 50

Writing numbers 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Beginner Note

Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.

10 Worked Examples with Answers and Very-Beginner Explanations

Worked Example 1

Problem: What does Writing numbers 41 to 50 mean?

  1. Say the topic in simple words.
  2. Use objects, fingers, a drawing, or a number example.
  3. Tell what you notice.

Very beginner explanation: Writing numbers 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Writing numbers 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Worked Example 2

Problem: Show one small example of Writing numbers 41 to 50.

  1. Choose small numbers or a simple shape/object.
  2. Make a model or drawing.
  3. Describe what the model shows.

Very beginner explanation: Writing numbers 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: A correct small model or drawing can show the meaning of Writing numbers 41 to 50.

Worked Example 3

Problem: Which tool could help with Writing numbers 41 to 50?

  1. Think about counters, fingers, a ten frame, number line, picture, table, or real object.
  2. Choose the tool that makes the idea easiest to see.

Very beginner explanation: Writing numbers 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Use a simple tool that lets you see and check the quantities or shapes.

Worked Example 4

Problem: How can you check your work in Writing numbers 41 to 50?

  1. Look at the objects, drawing, or numbers again.
  2. Count or compare one more time.
  3. Make sure the answer matches the question.

Very beginner explanation: Writing numbers 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Check by recounting, comparing, or using a second simple model.

Worked Example 5

Problem: Where might you use Writing numbers 41 to 50 in everyday life?

  1. Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
  2. Choose one situation.
  3. Explain how the math helps.

Very beginner explanation: Writing numbers 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Writing numbers 41 to 50 can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.

Worked Example 6

Problem: Count to 6. What number comes just before 6?

  1. Count forward until 6.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 5

Worked Example 7

Problem: Count to 12. What number comes just before 12?

  1. Count forward until 12.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 11

Worked Example 8

Problem: Count to 19. What number comes just before 19?

  1. Count forward until 19.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 18

Worked Example 9

Problem: Count to 27. What number comes just before 27?

  1. Count forward until 27.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 26

Worked Example 10

Problem: Count to 44. What number comes just before 44?

  1. Count forward until 44.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 43

Practice Exercise

Create one small question about Writing numbers 41 to 50. Show it with objects, a picture, or numbers, then check by counting or comparing again.

5.4 Making tens and ones

Making tens and ones helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Beginner Note

Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.

10 Worked Examples with Answers and Very-Beginner Explanations

Worked Example 1

Problem: What does Making tens and ones mean?

  1. Say the topic in simple words.
  2. Use objects, fingers, a drawing, or a number example.
  3. Tell what you notice.

Very beginner explanation: Making tens and ones helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Making tens and ones helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Worked Example 2

Problem: Show one small example of Making tens and ones.

  1. Choose small numbers or a simple shape/object.
  2. Make a model or drawing.
  3. Describe what the model shows.

Very beginner explanation: Making tens and ones helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: A correct small model or drawing can show the meaning of Making tens and ones.

Worked Example 3

Problem: Which tool could help with Making tens and ones?

  1. Think about counters, fingers, a ten frame, number line, picture, table, or real object.
  2. Choose the tool that makes the idea easiest to see.

Very beginner explanation: Making tens and ones helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Use a simple tool that lets you see and check the quantities or shapes.

Worked Example 4

Problem: How can you check your work in Making tens and ones?

  1. Look at the objects, drawing, or numbers again.
  2. Count or compare one more time.
  3. Make sure the answer matches the question.

Very beginner explanation: Making tens and ones helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Check by recounting, comparing, or using a second simple model.

Worked Example 5

Problem: Where might you use Making tens and ones in everyday life?

  1. Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
  2. Choose one situation.
  3. Explain how the math helps.

Very beginner explanation: Making tens and ones helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Making tens and ones can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.

Worked Example 6

Problem: How many tens and ones are in 10?

  1. 10 has 1 full group(s) of ten.
  2. 0 object(s) are left as ones.

Very beginner explanation: Groups of ten and leftover ones show place value.

Answer: 1 tens and 0 ones

Worked Example 7

Problem: How many tens and ones are in 12?

  1. 12 has 1 full group(s) of ten.
  2. 2 object(s) are left as ones.

Very beginner explanation: Groups of ten and leftover ones show place value.

Answer: 1 tens and 2 ones

Worked Example 8

Problem: How many tens and ones are in 19?

  1. 19 has 1 full group(s) of ten.
  2. 9 object(s) are left as ones.

Very beginner explanation: Groups of ten and leftover ones show place value.

Answer: 1 tens and 9 ones

Worked Example 9

Problem: How many tens and ones are in 27?

  1. 27 has 2 full group(s) of ten.
  2. 7 object(s) are left as ones.

Very beginner explanation: Groups of ten and leftover ones show place value.

Answer: 2 tens and 7 ones

Worked Example 10

Problem: How many tens and ones are in 44?

  1. 44 has 4 full group(s) of ten.
  2. 4 object(s) are left as ones.

Very beginner explanation: Groups of ten and leftover ones show place value.

Answer: 4 tens and 4 ones

Practice Exercise

Create one small question about Making tens and ones. Show it with objects, a picture, or numbers, then check by counting or comparing again.

5.5 Numbers before and after

Numbers before and after helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Beginner Note

Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.

10 Worked Examples with Answers and Very-Beginner Explanations

Worked Example 1

Problem: What does Numbers before and after mean?

  1. Say the topic in simple words.
  2. Use objects, fingers, a drawing, or a number example.
  3. Tell what you notice.

Very beginner explanation: Numbers before and after helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Numbers before and after helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Worked Example 2

Problem: Show one small example of Numbers before and after.

  1. Choose small numbers or a simple shape/object.
  2. Make a model or drawing.
  3. Describe what the model shows.

Very beginner explanation: Numbers before and after helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: A correct small model or drawing can show the meaning of Numbers before and after.

Worked Example 3

Problem: Which tool could help with Numbers before and after?

  1. Think about counters, fingers, a ten frame, number line, picture, table, or real object.
  2. Choose the tool that makes the idea easiest to see.

Very beginner explanation: Numbers before and after helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Use a simple tool that lets you see and check the quantities or shapes.

Worked Example 4

Problem: How can you check your work in Numbers before and after?

  1. Look at the objects, drawing, or numbers again.
  2. Count or compare one more time.
  3. Make sure the answer matches the question.

Very beginner explanation: Numbers before and after helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Check by recounting, comparing, or using a second simple model.

Worked Example 5

Problem: Where might you use Numbers before and after in everyday life?

  1. Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
  2. Choose one situation.
  3. Explain how the math helps.

Very beginner explanation: Numbers before and after helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Numbers before and after can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.

Worked Example 6

Problem: Count to 6. What number comes just before 6?

  1. Count forward until 6.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 5

Worked Example 7

Problem: Count to 12. What number comes just before 12?

  1. Count forward until 12.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 11

Worked Example 8

Problem: Count to 19. What number comes just before 19?

  1. Count forward until 19.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 18

Worked Example 9

Problem: Count to 27. What number comes just before 27?

  1. Count forward until 27.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 26

Worked Example 10

Problem: Count to 44. What number comes just before 44?

  1. Count forward until 44.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 43

Practice Exercise

Create one small question about Numbers before and after. Show it with objects, a picture, or numbers, then check by counting or comparing again.

5.6 Finding missing numbers

Finding missing numbers helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Beginner Note

Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.

10 Worked Examples with Answers and Very-Beginner Explanations

Worked Example 1

Problem: What does Finding missing numbers mean?

  1. Say the topic in simple words.
  2. Use objects, fingers, a drawing, or a number example.
  3. Tell what you notice.

Very beginner explanation: Finding missing numbers helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Finding missing numbers helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Worked Example 2

Problem: Show one small example of Finding missing numbers.

  1. Choose small numbers or a simple shape/object.
  2. Make a model or drawing.
  3. Describe what the model shows.

Very beginner explanation: Finding missing numbers helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: A correct small model or drawing can show the meaning of Finding missing numbers.

Worked Example 3

Problem: Which tool could help with Finding missing numbers?

  1. Think about counters, fingers, a ten frame, number line, picture, table, or real object.
  2. Choose the tool that makes the idea easiest to see.

Very beginner explanation: Finding missing numbers helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Use a simple tool that lets you see and check the quantities or shapes.

Worked Example 4

Problem: How can you check your work in Finding missing numbers?

  1. Look at the objects, drawing, or numbers again.
  2. Count or compare one more time.
  3. Make sure the answer matches the question.

Very beginner explanation: Finding missing numbers helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Check by recounting, comparing, or using a second simple model.

Worked Example 5

Problem: Where might you use Finding missing numbers in everyday life?

  1. Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
  2. Choose one situation.
  3. Explain how the math helps.

Very beginner explanation: Finding missing numbers helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Finding missing numbers can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.

Worked Example 6

Problem: Count to 6. What number comes just before 6?

  1. Count forward until 6.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 5

Worked Example 7

Problem: Count to 12. What number comes just before 12?

  1. Count forward until 12.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 11

Worked Example 8

Problem: Count to 19. What number comes just before 19?

  1. Count forward until 19.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 18

Worked Example 9

Problem: Count to 27. What number comes just before 27?

  1. Count forward until 27.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 26

Worked Example 10

Problem: Count to 44. What number comes just before 44?

  1. Count forward until 44.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 43

Practice Exercise

Create one small question about Finding missing numbers. Show it with objects, a picture, or numbers, then check by counting or comparing again.

5.7 Counting on within 50

Counting on within 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Beginner Note

Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.

10 Worked Examples with Answers and Very-Beginner Explanations

Worked Example 1

Problem: What does Counting on within 50 mean?

  1. Say the topic in simple words.
  2. Use objects, fingers, a drawing, or a number example.
  3. Tell what you notice.

Very beginner explanation: Counting on within 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Counting on within 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Worked Example 2

Problem: Show one small example of Counting on within 50.

  1. Choose small numbers or a simple shape/object.
  2. Make a model or drawing.
  3. Describe what the model shows.

Very beginner explanation: Counting on within 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: A correct small model or drawing can show the meaning of Counting on within 50.

Worked Example 3

Problem: Which tool could help with Counting on within 50?

  1. Think about counters, fingers, a ten frame, number line, picture, table, or real object.
  2. Choose the tool that makes the idea easiest to see.

Very beginner explanation: Counting on within 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Use a simple tool that lets you see and check the quantities or shapes.

Worked Example 4

Problem: How can you check your work in Counting on within 50?

  1. Look at the objects, drawing, or numbers again.
  2. Count or compare one more time.
  3. Make sure the answer matches the question.

Very beginner explanation: Counting on within 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Check by recounting, comparing, or using a second simple model.

Worked Example 5

Problem: Where might you use Counting on within 50 in everyday life?

  1. Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
  2. Choose one situation.
  3. Explain how the math helps.

Very beginner explanation: Counting on within 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Counting on within 50 can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.

Worked Example 6

Problem: Count to 6. What number comes just before 6?

  1. Count forward until 6.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 5

Worked Example 7

Problem: Count to 12. What number comes just before 12?

  1. Count forward until 12.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 11

Worked Example 8

Problem: Count to 19. What number comes just before 19?

  1. Count forward until 19.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 18

Worked Example 9

Problem: Count to 27. What number comes just before 27?

  1. Count forward until 27.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 26

Worked Example 10

Problem: Count to 44. What number comes just before 44?

  1. Count forward until 44.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 43

Practice Exercise

Create one small question about Counting on within 50. Show it with objects, a picture, or numbers, then check by counting or comparing again.

5.8 Counting back within 50

Counting back within 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Beginner Note

Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.

10 Worked Examples with Answers and Very-Beginner Explanations

Worked Example 1

Problem: What does Counting back within 50 mean?

  1. Say the topic in simple words.
  2. Use objects, fingers, a drawing, or a number example.
  3. Tell what you notice.

Very beginner explanation: Counting back within 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Counting back within 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Worked Example 2

Problem: Show one small example of Counting back within 50.

  1. Choose small numbers or a simple shape/object.
  2. Make a model or drawing.
  3. Describe what the model shows.

Very beginner explanation: Counting back within 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: A correct small model or drawing can show the meaning of Counting back within 50.

Worked Example 3

Problem: Which tool could help with Counting back within 50?

  1. Think about counters, fingers, a ten frame, number line, picture, table, or real object.
  2. Choose the tool that makes the idea easiest to see.

Very beginner explanation: Counting back within 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Use a simple tool that lets you see and check the quantities or shapes.

Worked Example 4

Problem: How can you check your work in Counting back within 50?

  1. Look at the objects, drawing, or numbers again.
  2. Count or compare one more time.
  3. Make sure the answer matches the question.

Very beginner explanation: Counting back within 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Check by recounting, comparing, or using a second simple model.

Worked Example 5

Problem: Where might you use Counting back within 50 in everyday life?

  1. Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
  2. Choose one situation.
  3. Explain how the math helps.

Very beginner explanation: Counting back within 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Counting back within 50 can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.

Worked Example 6

Problem: Count to 6. What number comes just before 6?

  1. Count forward until 6.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 5

Worked Example 7

Problem: Count to 12. What number comes just before 12?

  1. Count forward until 12.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 11

Worked Example 8

Problem: Count to 19. What number comes just before 19?

  1. Count forward until 19.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 18

Worked Example 9

Problem: Count to 27. What number comes just before 27?

  1. Count forward until 27.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 26

Worked Example 10

Problem: Count to 44. What number comes just before 44?

  1. Count forward until 44.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 43

Practice Exercise

Create one small question about Counting back within 50. Show it with objects, a picture, or numbers, then check by counting or comparing again.

5.9 Numbers 41 to 50 in context

Numbers 41 to 50 in context helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Beginner Note

Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.

10 Worked Examples with Answers and Very-Beginner Explanations

Worked Example 1

Problem: What does Numbers 41 to 50 in context mean?

  1. Say the topic in simple words.
  2. Use objects, fingers, a drawing, or a number example.
  3. Tell what you notice.

Very beginner explanation: Numbers 41 to 50 in context helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Numbers 41 to 50 in context helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Worked Example 2

Problem: Show one small example of Numbers 41 to 50 in context.

  1. Choose small numbers or a simple shape/object.
  2. Make a model or drawing.
  3. Describe what the model shows.

Very beginner explanation: Numbers 41 to 50 in context helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: A correct small model or drawing can show the meaning of Numbers 41 to 50 in context.

Worked Example 3

Problem: Which tool could help with Numbers 41 to 50 in context?

  1. Think about counters, fingers, a ten frame, number line, picture, table, or real object.
  2. Choose the tool that makes the idea easiest to see.

Very beginner explanation: Numbers 41 to 50 in context helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Use a simple tool that lets you see and check the quantities or shapes.

Worked Example 4

Problem: How can you check your work in Numbers 41 to 50 in context?

  1. Look at the objects, drawing, or numbers again.
  2. Count or compare one more time.
  3. Make sure the answer matches the question.

Very beginner explanation: Numbers 41 to 50 in context helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Check by recounting, comparing, or using a second simple model.

Worked Example 5

Problem: Where might you use Numbers 41 to 50 in context in everyday life?

  1. Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
  2. Choose one situation.
  3. Explain how the math helps.

Very beginner explanation: Numbers 41 to 50 in context helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Numbers 41 to 50 in context can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.

Worked Example 6

Problem: Count to 6. What number comes just before 6?

  1. Count forward until 6.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 5

Worked Example 7

Problem: Count to 12. What number comes just before 12?

  1. Count forward until 12.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 11

Worked Example 8

Problem: Count to 19. What number comes just before 19?

  1. Count forward until 19.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 18

Worked Example 9

Problem: Count to 27. What number comes just before 27?

  1. Count forward until 27.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 26

Worked Example 10

Problem: Count to 44. What number comes just before 44?

  1. Count forward until 44.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 43

Practice Exercise

Create one small question about Numbers 41 to 50 in context. Show it with objects, a picture, or numbers, then check by counting or comparing again.

5.10 Numbers 41 to 50 review

Numbers 41 to 50 review helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Beginner Note

Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.

10 Worked Examples with Answers and Very-Beginner Explanations

Worked Example 1

Problem: What does Numbers 41 to 50 review mean?

  1. Say the topic in simple words.
  2. Use objects, fingers, a drawing, or a number example.
  3. Tell what you notice.

Very beginner explanation: Numbers 41 to 50 review helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Numbers 41 to 50 review helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Worked Example 2

Problem: Show one small example of Numbers 41 to 50 review.

  1. Choose small numbers or a simple shape/object.
  2. Make a model or drawing.
  3. Describe what the model shows.

Very beginner explanation: Numbers 41 to 50 review helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: A correct small model or drawing can show the meaning of Numbers 41 to 50 review.

Worked Example 3

Problem: Which tool could help with Numbers 41 to 50 review?

  1. Think about counters, fingers, a ten frame, number line, picture, table, or real object.
  2. Choose the tool that makes the idea easiest to see.

Very beginner explanation: Numbers 41 to 50 review helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Use a simple tool that lets you see and check the quantities or shapes.

Worked Example 4

Problem: How can you check your work in Numbers 41 to 50 review?

  1. Look at the objects, drawing, or numbers again.
  2. Count or compare one more time.
  3. Make sure the answer matches the question.

Very beginner explanation: Numbers 41 to 50 review helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Check by recounting, comparing, or using a second simple model.

Worked Example 5

Problem: Where might you use Numbers 41 to 50 review in everyday life?

  1. Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
  2. Choose one situation.
  3. Explain how the math helps.

Very beginner explanation: Numbers 41 to 50 review helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Answer: Numbers 41 to 50 review can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.

Worked Example 6

Problem: Count to 6. What number comes just before 6?

  1. Count forward until 6.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 5

Worked Example 7

Problem: Count to 12. What number comes just before 12?

  1. Count forward until 12.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 11

Worked Example 8

Problem: Count to 19. What number comes just before 19?

  1. Count forward until 19.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 18

Worked Example 9

Problem: Count to 27. What number comes just before 27?

  1. Count forward until 27.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 26

Worked Example 10

Problem: Count to 44. What number comes just before 44?

  1. Count forward until 44.
  2. Move back one number.

Very beginner explanation: The number before is one less.

Answer: 43

Practice Exercise

Create one small question about Numbers 41 to 50 review. Show it with objects, a picture, or numbers, then check by counting or comparing again.

Chapter Notes, Practice, and Common Mistakes

Chapter Notes

  • Read or listen to the question before solving.
  • Use objects, a drawing, ten frame, number line, table, graph, or simple number sentence when useful.
  • Explain your thinking and check by counting, comparing, or using another simple model.

Extra Practice

  1. Create and solve one original problem about Counting from 41 to 50.
  2. Create and solve one original problem about Reading numbers 41 to 50.
  3. Create and solve one original problem about Writing numbers 41 to 50.
  4. Create and solve one original problem about Making tens and ones.
  5. Create and solve one original problem about Numbers before and after.
  6. Create and solve one original problem about Finding missing numbers.

Common Mistakes

  • Skipping the meaning and trying to memorize a rule only.
  • Using the wrong operation because the question was not read completely.
  • Ignoring units, labels, place values, or the context of the problem.
  • Not estimating or checking whether the final answer is reasonable.
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30 Review Questions and Answers

Q1. What is the main idea in Counting from 41 to 50?

Answer: Counting from 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Q2. What is the main idea in Reading numbers 41 to 50?

Answer: Reading numbers 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Q3. What is the main idea in Writing numbers 41 to 50?

Answer: Writing numbers 41 to 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Q4. What is the main idea in Making tens and ones?

Answer: Making tens and ones helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Q5. What is the main idea in Numbers before and after?

Answer: Numbers before and after helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Q6. What is the main idea in Finding missing numbers?

Answer: Finding missing numbers helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Q7. What is the main idea in Counting on within 50?

Answer: Counting on within 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Q8. What is the main idea in Counting back within 50?

Answer: Counting back within 50 helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Q9. What is the main idea in Numbers 41 to 50 in context?

Answer: Numbers 41 to 50 in context helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Q10. What is the main idea in Numbers 41 to 50 review?

Answer: Numbers 41 to 50 review helps Grade 1 learners build strong number sense with small numbers, objects, drawings, and number lines.

Q11. Why is it useful to use counters or drawings?

Answer: They make the quantities visible and help you understand before using only numbers.

Q12. Why should you count carefully?

Answer: Careful counting means each object is counted once and no object is missed.

Q13. What can you do if a problem feels hard?

Answer: Use smaller numbers, draw a picture, use objects, and solve one small step at a time.

Q14. Why should both sides of an equals sign match?

Answer: The equals sign means the two sides have the same value.

Q15. How can a number line help?

Answer: It shows number order and can help you count forward or backward.

Q16. How can a ten frame help?

Answer: It organizes objects into groups that make numbers and addition easier to see.

Q17. Why are equal shares important?

Answer: Equal shares make fair groups or equal parts.

Q18. How do patterns help us predict?

Answer: A pattern rule tells us what should come next.

Q19. Why do we label a graph or table?

Answer: Labels tell us what the information represents.

Q20. How can you describe a shape?

Answer: Talk about its sides, corners, flat or curved surfaces, and other visible attributes.

Q21. How can you compare two objects?

Answer: Choose one attribute, such as length, mass, or capacity, and compare that same attribute.

Q22. Why is a calendar useful?

Answer: It organizes days, weeks, months, dates, and events.

Q23. Why does money have different values?

Answer: Different coins and bills represent different amounts of money.

Q24. Why should you explain your answer?

Answer: Explaining shows how you thought about the problem and helps you check your reasoning.

Q25. What should you do after a mistake?

Answer: Look at the step again, fix it, and try a similar example.

Q26. How can you be a confident math learner?

Answer: Use positive self-talk, try a strategy, ask questions, and remember that mistakes help you learn.

Q27. When should you use a picture?

Answer: Use a picture when it helps you see quantities, shapes, positions, or a story problem.

Q28. When should you use objects?

Answer: Use objects when you want to count, join, take away, share, sort, or compare in a hands-on way.

Q29. How can you check addition?

Answer: Recount the combined objects or use another model.

Q30. How can you check subtraction?

Answer: Put the taken-away part and the part left back together to see if they make the starting amount.