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Year 2 Mental Addition and Subtraction Strategies Worksheet — Level 3 — Practice Set 4 — Answers

Answer sheet with worked solutions for the Year 2 addition worksheet.

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Success TutoringWorksheetsAnswer sheetYear 2 · Mathematics · Addition

Year 2 Mental Addition and Subtraction Strategies Worksheet — Level 3 — Practice Set 4 — Answers

Fill in each step of the strategy, then write the answer.

1.62 + 38 = 62 + 40 − (answer space) = (answer space)

Answer: 2, 100

  1. 62 + 40 = 102
  2. 102 − 2 = 100
2.24 − 9 = 24 − 10 + (answer space) = (answer space)

Answer: 1, 15

  1. 24 − 10 = 14
  2. I took away 1 too many, so add it back: 14 + 1 = 15
3.134 − 7 = 134 − 4 − (answer space) = (answer space)

Answer: 3, 127

  1. 134 − 4 = 130 (back to a ten)
  2. 130 − 3 = 127
4.45 + 28 = 45 + 30 − (answer space) = (answer space)

Answer: 2, 73

  1. 45 + 30 = 75
  2. 75 − 2 = 73
5.124 − 99 = 124 − 100 + (answer space) = (answer space)

Answer: 1, 25

  1. 124 − 100 = 24
  2. I took away 1 too many, so add it back: 24 + 1 = 25
6.112 − 6 = 112 − 2 − (answer space) = (answer space)

Answer: 4, 106

  1. 112 − 2 = 110 (back to a ten)
  2. 110 − 4 = 106
7.89 + 38 = 89 + 40 − (answer space) = (answer space)

Answer: 2, 127

  1. 89 + 40 = 129
  2. 129 − 2 = 127
8.66 − 38 = 66 − 40 + (answer space) = (answer space)

Answer: 2, 28

  1. 66 − 40 = 26
  2. I took away 2 too many, so add it back: 26 + 2 = 28
9.54 − 8 = 54 − 4 − (answer space) = (answer space)

Answer: 4, 46

  1. 54 − 4 = 50 (back to a ten)
  2. 50 − 4 = 46
10.123 + 48 = 123 + 50 − (answer space) = (answer space)

Answer: 2, 171

  1. 123 + 50 = 173
  2. 173 − 2 = 171
11.60 − 48 = 60 − 50 + (answer space) = (answer space)

Answer: 2, 12

  1. 60 − 50 = 10
  2. I took away 2 too many, so add it back: 10 + 2 = 12
12.161 − 6 = 161 − 1 − (answer space) = (answer space)

Answer: 5, 155

  1. 161 − 1 = 160 (back to a ten)
  2. 160 − 5 = 155
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