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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.

1.38 + 9 = 38 + 10 − (answer space) = (answer space)

Answer: 1, 47

  1. 38 + 10 = 48
  2. 48 − 1 = 47
2.151 − 98 = 151 − 100 + (answer space) = (answer space)

Answer: 2, 53

  1. 151 − 100 = 51
  2. I took away 2 too many, so add it back: 51 + 2 = 53
3.182 − 3 = 182 − 2 − (answer space) = (answer space)

Answer: 1, 179

  1. 182 − 2 = 180 (back to a ten)
  2. 180 − 1 = 179
4.154 + 59 = 154 + 60 − (answer space) = (answer space)

Answer: 1, 213

  1. 154 + 60 = 214
  2. 214 − 1 = 213
5.87 − 9 = 87 − 10 + (answer space) = (answer space)

Answer: 1, 78

  1. 87 − 10 = 77
  2. I took away 1 too many, so add it back: 77 + 1 = 78
6.142 − 3 = 142 − 2 − (answer space) = (answer space)

Answer: 1, 139

  1. 142 − 2 = 140 (back to a ten)
  2. 140 − 1 = 139
7.44 + 29 = 44 + 30 − (answer space) = (answer space)

Answer: 1, 73

  1. 44 + 30 = 74
  2. 74 − 1 = 73
8.62 − 9 = 62 − 10 + (answer space) = (answer space)

Answer: 1, 53

  1. 62 − 10 = 52
  2. I took away 1 too many, so add it back: 52 + 1 = 53
9.22 − 3 = 22 − 2 − (answer space) = (answer space)

Answer: 1, 19

  1. 22 − 2 = 20 (back to a ten)
  2. 20 − 1 = 19
10.33 + 28 = 33 + 30 − (answer space) = (answer space)

Answer: 2, 61

  1. 33 + 30 = 63
  2. 63 − 2 = 61
11.149 − 39 = 149 − 40 + (answer space) = (answer space)

Answer: 1, 110

  1. 149 − 40 = 109
  2. I took away 1 too many, so add it back: 109 + 1 = 110
12.152 − 4 = 152 − 2 − (answer space) = (answer space)

Answer: 2, 148

  1. 152 − 2 = 150 (back to a ten)
  2. 150 − 2 = 148
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