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Chapter 7: Skip Counting by 2s

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 2s with simple explanations, visual thinking, worked examples, practice, and review.

7.1 Counting by 2s 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 39, 44, 49, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 54, 59

Worked Example 2

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

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 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

Worked Example 5

Problem: Continue 39, 40, 41, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 42, 43

Worked Example 6

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 7

Problem: Continue 6, 7, 8, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 9, 10

Worked Example 8

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 9

Problem: Continue 5, 15, 25, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 35, 45

Worked Example 10

Problem: Continue 27, 32, 37, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 42, 47

7.2 Counting by 2s from an even number

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 38, 48, 58, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 68, 78

Worked Example 2

Problem: Continue 2, 12, 22, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 32, 42

Worked Example 3

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 4

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 5

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 6

Problem: Continue 1, 11, 21, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 31, 41

Worked Example 7

Problem: Continue 24, 25, 26, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 27, 28

Worked Example 8

Problem: Continue 5, 10, 15, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 20, 25

Worked Example 9

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 10

Problem: Continue 13, 18, 23, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 28, 33

7.3 Counting by 2s 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 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 2

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 3

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 4

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 5

Problem: Continue 6, 8, 10, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 12, 14

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 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 8

Problem: Continue 6, 16, 26, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 36, 46

Worked Example 9

Problem: Continue 4, 5, 6, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 7, 8

Worked Example 10

Problem: Continue 25, 35, 45, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 55, 65

7.4 Finding missing numbers in a 2s pattern

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 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 2

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 3

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 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 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

Worked Example 6

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 7

Problem: Continue 19, 20, 21, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 22, 23

Worked Example 8

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 9

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 10

Problem: Continue 39, 40, 41, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 42, 43

7.5 Using pairs to count

Using pairs to count 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 9 and 16 to make a simple example about Using pairs to count.

  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 Using pairs to count.

Worked Example 2

Problem: Use 12 and 17 to make a simple example about Using pairs to count.

  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 Using pairs to count.

Worked Example 3

Problem: Use 20 and 1 to make a simple example about Using pairs to count.

  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 Using pairs to count.

Worked Example 4

Problem: Use 13 and 9 to make a simple example about Using pairs to count.

  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 Using pairs to count.

Worked Example 5

Problem: Use 15 and 9 to make a simple example about Using pairs to count.

  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 Using pairs to count.

Worked Example 6

Problem: Use 5 and 5 to make a simple example about Using pairs to count.

  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 Using pairs to count.

Worked Example 7

Problem: Use 7 and 3 to make a simple example about Using pairs to count.

  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 Using pairs to count.

Worked Example 8

Problem: Use 13 and 5 to make a simple example about Using pairs to count.

  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 Using pairs to count.

Worked Example 9

Problem: Use 19 and 11 to make a simple example about Using pairs to count.

  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 Using pairs to count.

Worked Example 10

Problem: Use 15 and 6 to make a simple example about Using pairs to count.

  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 Using pairs to count.

7.6 Skip counting on a number line

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 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 2

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 3

Problem: Continue 21, 22, 23, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 24, 25

Worked Example 4

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 5

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 6

Problem: Continue 30, 35, 40, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 45, 50

Worked Example 7

Problem: Continue 1, 6, 11, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 16, 21

Worked Example 8

Problem: Continue 22, 27, 32, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 37, 42

Worked Example 9

Problem: Continue 35, 40, 45, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 50, 55

Worked Example 10

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

7.7 Skip counting on a hundreds chart

Place value tells how much a digit is worth because of its position in a number. Use objects, drawings, number lines, tables, or number sentences when useful.

10 Worked Examples with Answers

Worked Example 1

Problem: How many hundreds, tens, and ones are in 109?

  1. Read the hundreds digit.
  2. Read the tens digit.
  3. Read the ones digit.

Very beginner explanation: Position tells place value.

Answer: 1 hundred, 0 tens, 9 ones

Worked Example 2

Problem: How many hundreds, tens, and ones are in 169?

  1. Read the hundreds digit.
  2. Read the tens digit.
  3. Read the ones digit.

Very beginner explanation: Position tells place value.

Answer: 1 hundred, 6 tens, 9 ones

Worked Example 3

Problem: How many hundreds, tens, and ones are in 110?

  1. Read the hundreds digit.
  2. Read the tens digit.
  3. Read the ones digit.

Very beginner explanation: Position tells place value.

Answer: 1 hundred, 1 tens, 0 ones

Worked Example 4

Problem: How many hundreds, tens, and ones are in 174?

  1. Read the hundreds digit.
  2. Read the tens digit.
  3. Read the ones digit.

Very beginner explanation: Position tells place value.

Answer: 1 hundred, 7 tens, 4 ones

Worked Example 5

Problem: How many hundreds, tens, and ones are in 190?

  1. Read the hundreds digit.
  2. Read the tens digit.
  3. Read the ones digit.

Very beginner explanation: Position tells place value.

Answer: 1 hundred, 9 tens, 0 ones

Worked Example 6

Problem: How many hundreds, tens, and ones are in 197?

  1. Read the hundreds digit.
  2. Read the tens digit.
  3. Read the ones digit.

Very beginner explanation: Position tells place value.

Answer: 1 hundred, 9 tens, 7 ones

Worked Example 7

Problem: How many hundreds, tens, and ones are in 111?

  1. Read the hundreds digit.
  2. Read the tens digit.
  3. Read the ones digit.

Very beginner explanation: Position tells place value.

Answer: 1 hundred, 1 tens, 1 ones

Worked Example 8

Problem: How many hundreds, tens, and ones are in 194?

  1. Read the hundreds digit.
  2. Read the tens digit.
  3. Read the ones digit.

Very beginner explanation: Position tells place value.

Answer: 1 hundred, 9 tens, 4 ones

Worked Example 9

Problem: How many hundreds, tens, and ones are in 105?

  1. Read the hundreds digit.
  2. Read the tens digit.
  3. Read the ones digit.

Very beginner explanation: Position tells place value.

Answer: 1 hundred, 0 tens, 5 ones

Worked Example 10

Problem: How many hundreds, tens, and ones are in 193?

  1. Read the hundreds digit.
  2. Read the tens digit.
  3. Read the ones digit.

Very beginner explanation: Position tells place value.

Answer: 1 hundred, 9 tens, 3 ones

7.8 Connecting 2s to doubles

Connecting 2s to doubles 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 14 and 18 to make a simple example about Connecting 2s to doubles.

  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 Connecting 2s to doubles.

Worked Example 2

Problem: Use 9 and 11 to make a simple example about Connecting 2s to doubles.

  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 Connecting 2s to doubles.

Worked Example 3

Problem: Use 4 and 10 to make a simple example about Connecting 2s to doubles.

  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 Connecting 2s to doubles.

Worked Example 4

Problem: Use 8 and 15 to make a simple example about Connecting 2s to doubles.

  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 Connecting 2s to doubles.

Worked Example 5

Problem: Use 10 and 15 to make a simple example about Connecting 2s to doubles.

  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 Connecting 2s to doubles.

Worked Example 6

Problem: Use 12 and 17 to make a simple example about Connecting 2s to doubles.

  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 Connecting 2s to doubles.

Worked Example 7

Problem: Use 17 and 17 to make a simple example about Connecting 2s to doubles.

  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 Connecting 2s to doubles.

Worked Example 8

Problem: Use 12 and 7 to make a simple example about Connecting 2s to doubles.

  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 Connecting 2s to doubles.

Worked Example 9

Problem: Use 17 and 7 to make a simple example about Connecting 2s to doubles.

  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 Connecting 2s to doubles.

Worked Example 10

Problem: Use 3 and 2 to make a simple example about Connecting 2s to doubles.

  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 Connecting 2s to doubles.

7.9 Even-number 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 40, 50, 60, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 70, 80

Worked Example 2

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 3

Problem: Continue 1, 6, 11, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 16, 21

Worked Example 4

Problem: Continue 20, 30, 40, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 50, 60

Worked Example 5

Problem: Continue 36, 41, 46, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 51, 56

Worked Example 6

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 7

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 8

Problem: Continue 9, 11, 13, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 15, 17

Worked Example 9

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 10

Problem: Continue 35, 45, 55, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 65, 75

7.10 Counting collections by 2s

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 25, 35, 45, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 55, 65

Worked Example 2

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 3

Problem: Continue 25, 35, 45, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 55, 65

Worked Example 4

Problem: Continue 27, 29, 31, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 33, 35

Worked Example 5

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 6

Problem: Continue 6, 7, 8, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 9, 10

Worked Example 7

Problem: Continue 11, 12, 13, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 14, 15

Worked Example 8

Problem: Continue 20, 30, 40, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 50, 60

Worked Example 9

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 10

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

7.11 Backward skip counting by 2s

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 36, 41, 46, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 51, 56

Worked Example 2

Problem: Continue 0, 1, 2, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 3, 4

Worked Example 3

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 4

Problem: Continue 2, 3, 4, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 5, 6

Worked Example 5

Problem: Continue 36, 46, 56, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 66, 76

Worked Example 6

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

Worked Example 7

Problem: Continue 20, 25, 30, ...

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

Very beginner explanation: Counting patterns use a consistent step.

Answer: 35, 40

Worked Example 8

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 9

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 10

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

7.12 Checking a 2s sequence

Checking a 2s sequence 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 6 and 3 to make a simple example about Checking a 2s sequence.

  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 Checking a 2s sequence.

Worked Example 2

Problem: Use 18 and 15 to make a simple example about Checking a 2s sequence.

  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 Checking a 2s sequence.

Worked Example 3

Problem: Use 8 and 8 to make a simple example about Checking a 2s sequence.

  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 Checking a 2s sequence.

Worked Example 4

Problem: Use 12 and 2 to make a simple example about Checking a 2s sequence.

  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 Checking a 2s sequence.

Worked Example 5

Problem: Use 19 and 5 to make a simple example about Checking a 2s sequence.

  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 Checking a 2s sequence.

Worked Example 6

Problem: Use 4 and 11 to make a simple example about Checking a 2s sequence.

  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 Checking a 2s sequence.

Worked Example 7

Problem: Use 1 and 16 to make a simple example about Checking a 2s sequence.

  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 Checking a 2s sequence.

Worked Example 8

Problem: Use 9 and 17 to make a simple example about Checking a 2s sequence.

  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 Checking a 2s sequence.

Worked Example 9

Problem: Use 17 and 19 to make a simple example about Checking a 2s sequence.

  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 Checking a 2s sequence.

Worked Example 10

Problem: Use 18 and 16 to make a simple example about Checking a 2s sequence.

  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 Checking a 2s sequence.

30 Review Questions and Answers

Q1. What should a Grade 2 learner understand about Counting by 2s 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 2s from an even number?

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

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

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

Q4. What should a Grade 2 learner understand about Finding missing numbers in a 2s pattern?

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

Q5. What should a Grade 2 learner understand about Using pairs to count?

Answer: Using pairs to count is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

Q6. What should a Grade 2 learner understand about Skip counting on a number line?

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

Q7. What should a Grade 2 learner understand about Skip counting on a hundreds chart?

Answer: Place value tells how much a digit is worth because of its position in a number.

Q8. What should a Grade 2 learner understand about Connecting 2s to doubles?

Answer: Connecting 2s to doubles is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

Q9. What should a Grade 2 learner understand about Even-number 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 Counting collections by 2s?

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

Q11. What should a Grade 2 learner understand about Backward skip counting by 2s?

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

Q12. What should a Grade 2 learner understand about Checking a 2s sequence?

Answer: Checking a 2s sequence 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 Counting by 2s 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 2s from an even number?

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

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

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

Q16. What should a Grade 2 learner understand about Finding missing numbers in a 2s pattern?

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

Q17. What should a Grade 2 learner understand about Using pairs to count?

Answer: Using pairs to count is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

Q18. What should a Grade 2 learner understand about Skip counting on a number line?

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

Q19. What should a Grade 2 learner understand about Skip counting on a hundreds chart?

Answer: Place value tells how much a digit is worth because of its position in a number.

Q20. What should a Grade 2 learner understand about Connecting 2s to doubles?

Answer: Connecting 2s to doubles is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

Q21. What should a Grade 2 learner understand about Even-number 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 Counting collections by 2s?

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

Q23. What should a Grade 2 learner understand about Backward skip counting by 2s?

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

Q24. What should a Grade 2 learner understand about Checking a 2s sequence?

Answer: Checking a 2s sequence 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 Counting by 2s 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 2s from an even number?

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

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

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

Q28. What should a Grade 2 learner understand about Finding missing numbers in a 2s pattern?

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

Q29. What should a Grade 2 learner understand about Using pairs to count?

Answer: Using pairs to count is a Grade 2 math idea best learned with simple numbers, objects, drawings, and clear words.

Q30. What should a Grade 2 learner understand about Skip counting on a number line?

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