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Chapter 9: Skip Counting by 10s and 25s

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 Skip Counting by 10s and 25s with simple explanations, visual thinking, worked examples, practice, and review.

9.1 Counting by 10s from 0

Counting patterns organize numbers and help with addition, subtraction, and number relationships. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Continue 3, 5, 7, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 9, 11

Worked Example 2

Problem: Continue 11, 21, 31, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 41, 51

Worked Example 3

Problem: Continue 16, 26, 36, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 46, 56

Worked Example 4

Problem: Continue 30, 32, 34, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 36, 38

Worked Example 5

Problem: Continue 22, 32, 42, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 52, 62

Worked Example 6

Problem: Continue 0, 10, 20, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 30, 40

Worked Example 7

Problem: Continue 13, 23, 33, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 43, 53

Worked Example 8

Problem: Continue 37, 39, 41, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 43, 45

Worked Example 9

Problem: Continue 8, 18, 28, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 38, 48

Worked Example 10

Problem: Continue 12, 22, 32, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 42, 52

9.2 Counting by 10s from a multiple of 10

Counting patterns organize numbers and help with addition, subtraction, and number relationships. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Continue 32, 42, 52, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 62, 72

Worked Example 2

Problem: Continue 4, 14, 24, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 34, 44

Worked Example 3

Problem: Continue 28, 33, 38, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 43, 48

Worked Example 4

Problem: Continue 17, 22, 27, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 32, 37

Worked Example 5

Problem: Continue 24, 29, 34, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 39, 44

Worked Example 6

Problem: Continue 10, 15, 20, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 25, 30

Worked Example 7

Problem: Continue 35, 36, 37, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 38, 39

Worked Example 8

Problem: Continue 8, 9, 10, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 11, 12

Worked Example 9

Problem: Continue 2, 7, 12, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 17, 22

Worked Example 10

Problem: Continue 3, 8, 13, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 18, 23

9.3 Counting by 10s to 200

Counting patterns organize numbers and help with addition, subtraction, and number relationships. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Continue 16, 26, 36, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 46, 56

Worked Example 2

Problem: Continue 18, 23, 28, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 33, 38

Worked Example 3

Problem: Continue 4, 6, 8, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 10, 12

Worked Example 4

Problem: Continue 35, 36, 37, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 38, 39

Worked Example 5

Problem: Continue 12, 17, 22, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 27, 32

Worked Example 6

Problem: Continue 29, 30, 31, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 32, 33

Worked Example 7

Problem: Continue 33, 34, 35, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 36, 37

Worked Example 8

Problem: Continue 17, 27, 37, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 47, 57

Worked Example 9

Problem: Continue 4, 6, 8, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 10, 12

Worked Example 10

Problem: Continue 2, 7, 12, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 17, 22

9.4 Backward counting by 10s

Counting patterns organize numbers and help with addition, subtraction, and number relationships. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Continue 8, 9, 10, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 11, 12

Worked Example 2

Problem: Continue 9, 19, 29, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 39, 49

Worked Example 3

Problem: Continue 15, 16, 17, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 18, 19

Worked Example 4

Problem: Continue 16, 18, 20, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 22, 24

Worked Example 5

Problem: Continue 5, 6, 7, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 8, 9

Worked Example 6

Problem: Continue 1, 3, 5, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 7, 9

Worked Example 7

Problem: Continue 29, 39, 49, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 59, 69

Worked Example 8

Problem: Continue 33, 43, 53, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 63, 73

Worked Example 9

Problem: Continue 8, 13, 18, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 23, 28

Worked Example 10

Problem: Continue 22, 23, 24, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 25, 26

9.5 Counting by 25s

Counting patterns organize numbers and help with addition, subtraction, and number relationships. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Continue 34, 39, 44, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 49, 54

Worked Example 2

Problem: Continue 33, 35, 37, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 39, 41

Worked Example 3

Problem: Continue 9, 14, 19, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 24, 29

Worked Example 4

Problem: Continue 15, 20, 25, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 30, 35

Worked Example 5

Problem: Continue 8, 9, 10, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 11, 12

Worked Example 6

Problem: Continue 17, 27, 37, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 47, 57

Worked Example 7

Problem: Continue 9, 10, 11, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 12, 13

Worked Example 8

Problem: Continue 21, 26, 31, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 36, 41

Worked Example 9

Problem: Continue 34, 35, 36, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 37, 38

Worked Example 10

Problem: Continue 18, 19, 20, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 21, 22

9.6 Counting 25 50 75 100

Counting patterns organize numbers and help with addition, subtraction, and number relationships. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Continue 32, 33, 34, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 35, 36

Worked Example 2

Problem: Continue 14, 19, 24, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 29, 34

Worked Example 3

Problem: Continue 15, 20, 25, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 30, 35

Worked Example 4

Problem: Continue 13, 14, 15, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 16, 17

Worked Example 5

Problem: Continue 37, 42, 47, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 52, 57

Worked Example 6

Problem: Continue 37, 42, 47, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 52, 57

Worked Example 7

Problem: Continue 40, 41, 42, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 43, 44

Worked Example 8

Problem: Continue 20, 22, 24, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 26, 28

Worked Example 9

Problem: Continue 25, 26, 27, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 28, 29

Worked Example 10

Problem: Continue 1, 2, 3, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 4, 5

9.7 Counting quarters by value

Counting patterns organize numbers and help with addition, subtraction, and number relationships. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Continue 24, 26, 28, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 30, 32

Worked Example 2

Problem: Continue 3, 8, 13, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 18, 23

Worked Example 3

Problem: Continue 28, 38, 48, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 58, 68

Worked Example 4

Problem: Continue 33, 35, 37, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 39, 41

Worked Example 5

Problem: Continue 0, 2, 4, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 6, 8

Worked Example 6

Problem: Continue 16, 18, 20, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 22, 24

Worked Example 7

Problem: Continue 16, 26, 36, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 46, 56

Worked Example 8

Problem: Continue 21, 31, 41, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 51, 61

Worked Example 9

Problem: Continue 7, 9, 11, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 13, 15

Worked Example 10

Problem: Continue 36, 38, 40, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 42, 44

9.8 Patterns when counting by 25s

Counting patterns organize numbers and help with addition, subtraction, and number relationships. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Continue 20, 21, 22, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 23, 24

Worked Example 2

Problem: Continue 19, 21, 23, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 25, 27

Worked Example 3

Problem: Continue 33, 35, 37, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 39, 41

Worked Example 4

Problem: Continue 12, 13, 14, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 15, 16

Worked Example 5

Problem: Continue 20, 22, 24, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 26, 28

Worked Example 6

Problem: Continue 31, 41, 51, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 61, 71

Worked Example 7

Problem: Continue 17, 22, 27, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 32, 37

Worked Example 8

Problem: Continue 4, 9, 14, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 19, 24

Worked Example 9

Problem: Continue 31, 32, 33, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 34, 35

Worked Example 10

Problem: Continue 33, 43, 53, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 63, 73

9.9 Missing terms in 10s patterns

A pattern follows a rule. Repeating patterns repeat a core; growing patterns change in a predictable way. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Continue 15, 17, 19, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 21, 23

Worked Example 2

Problem: Continue 5, 7, 9, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 11, 13

Worked Example 3

Problem: Continue 30, 31, 32, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 33, 34

Worked Example 4

Problem: Continue 8, 13, 18, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 23, 28

Worked Example 5

Problem: Continue 17, 22, 27, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 32, 37

Worked Example 6

Problem: Continue 24, 34, 44, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 54, 64

Worked Example 7

Problem: Continue 37, 47, 57, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 67, 77

Worked Example 8

Problem: Continue 15, 25, 35, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 45, 55

Worked Example 9

Problem: Continue 29, 31, 33, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 35, 37

Worked Example 10

Problem: Continue 8, 13, 18, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 23, 28

9.10 Missing terms in 25s patterns

A pattern follows a rule. Repeating patterns repeat a core; growing patterns change in a predictable way. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Continue 3, 4, 5, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 6, 7

Worked Example 2

Problem: Continue 26, 27, 28, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 29, 30

Worked Example 3

Problem: Continue 17, 27, 37, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 47, 57

Worked Example 4

Problem: Continue 8, 9, 10, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 11, 12

Worked Example 5

Problem: Continue 18, 23, 28, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 33, 38

Worked Example 6

Problem: Continue 4, 6, 8, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 10, 12

Worked Example 7

Problem: Continue 1, 2, 3, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 4, 5

Worked Example 8

Problem: Continue 14, 15, 16, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 17, 18

Worked Example 9

Problem: Continue 14, 16, 18, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 20, 22

Worked Example 10

Problem: Continue 7, 12, 17, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 22, 27

9.11 Choosing 10s or 25s

Choosing 10s or 25s 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 19 to make a simple example about Choosing 10s or 25s.

  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 Choosing 10s or 25s.

Worked Example 2

Problem: Use 10 and 3 to make a simple example about Choosing 10s or 25s.

  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 Choosing 10s or 25s.

Worked Example 3

Problem: Use 5 and 5 to make a simple example about Choosing 10s or 25s.

  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 Choosing 10s or 25s.

Worked Example 4

Problem: Use 7 and 7 to make a simple example about Choosing 10s or 25s.

  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 Choosing 10s or 25s.

Worked Example 5

Problem: Use 10 and 11 to make a simple example about Choosing 10s or 25s.

  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 Choosing 10s or 25s.

Worked Example 6

Problem: Use 17 and 17 to make a simple example about Choosing 10s or 25s.

  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 Choosing 10s or 25s.

Worked Example 7

Problem: Use 3 and 14 to make a simple example about Choosing 10s or 25s.

  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 Choosing 10s or 25s.

Worked Example 8

Problem: Use 20 and 1 to make a simple example about Choosing 10s or 25s.

  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 Choosing 10s or 25s.

Worked Example 9

Problem: Use 2 and 7 to make a simple example about Choosing 10s or 25s.

  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 Choosing 10s or 25s.

Worked Example 10

Problem: Use 6 and 11 to make a simple example about Choosing 10s or 25s.

  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 Choosing 10s or 25s.

9.12 Real-life skip-counting problems

Counting patterns organize numbers and help with addition, subtraction, and number relationships. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: Continue 22, 23, 24, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 25, 26

Worked Example 2

Problem: Continue 7, 17, 27, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 37, 47

Worked Example 3

Problem: Continue 37, 38, 39, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 40, 41

Worked Example 4

Problem: Continue 22, 32, 42, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 52, 62

Worked Example 5

Problem: Continue 1, 3, 5, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 7, 9

Worked Example 6

Problem: Continue 10, 11, 12, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 13, 14

Worked Example 7

Problem: Continue 33, 38, 43, ...

  1. The rule is add 5.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 48, 53

Worked Example 8

Problem: Continue 38, 39, 40, ...

  1. The rule is add 1.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 41, 42

Worked Example 9

Problem: Continue 18, 28, 38, ...

  1. The rule is add 10.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 48, 58

Worked Example 10

Problem: Continue 8, 10, 12, ...

  1. The rule is add 2.
  2. Use the same rule again.

Very beginner explanation: Counting patterns use a consistent step.

Answer: 14, 16

30 Review Questions and Answers

Q1. What should a Grade 2 learner understand about Counting by 10s from 0?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q2. What should a Grade 2 learner understand about Counting by 10s from a multiple of 10?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q3. What should a Grade 2 learner understand about Counting by 10s to 200?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q4. What should a Grade 2 learner understand about Backward counting by 10s?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q5. What should a Grade 2 learner understand about Counting by 25s?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q6. What should a Grade 2 learner understand about Counting 25 50 75 100?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q7. What should a Grade 2 learner understand about Counting quarters by value?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q8. What should a Grade 2 learner understand about Patterns when counting by 25s?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q9. What should a Grade 2 learner understand about Missing terms in 10s patterns?

Answer: A pattern follows a rule. Repeating patterns repeat a core; growing patterns change in a predictable way.

Q10. What should a Grade 2 learner understand about Missing terms in 25s patterns?

Answer: A pattern follows a rule. Repeating patterns repeat a core; growing patterns change in a predictable way.

Q11. What should a Grade 2 learner understand about Choosing 10s or 25s?

Answer: Choosing 10s or 25s is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

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

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q13. What should a Grade 2 learner understand about Counting by 10s from 0?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q14. What should a Grade 2 learner understand about Counting by 10s from a multiple of 10?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q15. What should a Grade 2 learner understand about Counting by 10s to 200?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q16. What should a Grade 2 learner understand about Backward counting by 10s?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q17. What should a Grade 2 learner understand about Counting by 25s?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q18. What should a Grade 2 learner understand about Counting 25 50 75 100?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q19. What should a Grade 2 learner understand about Counting quarters by value?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q20. What should a Grade 2 learner understand about Patterns when counting by 25s?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q21. What should a Grade 2 learner understand about Missing terms in 10s patterns?

Answer: A pattern follows a rule. Repeating patterns repeat a core; growing patterns change in a predictable way.

Q22. What should a Grade 2 learner understand about Missing terms in 25s patterns?

Answer: A pattern follows a rule. Repeating patterns repeat a core; growing patterns change in a predictable way.

Q23. What should a Grade 2 learner understand about Choosing 10s or 25s?

Answer: Choosing 10s or 25s is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

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

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q25. What should a Grade 2 learner understand about Counting by 10s from 0?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q26. What should a Grade 2 learner understand about Counting by 10s from a multiple of 10?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q27. What should a Grade 2 learner understand about Counting by 10s to 200?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q28. What should a Grade 2 learner understand about Backward counting by 10s?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q29. What should a Grade 2 learner understand about Counting by 25s?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.

Q30. What should a Grade 2 learner understand about Counting 25 50 75 100?

Answer: Counting patterns organize numbers and help with addition, subtraction, and number relationships.