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

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

1.103 + 59 = 103 + 60 − (answer space) = (answer space)

Answer: 1, 162

  1. 103 + 60 = 163
  2. 163 − 1 = 162
2.123 − 98 = 123 − 100 + (answer space) = (answer space)

Answer: 2, 25

  1. 123 − 100 = 23
  2. I took away 2 too many, so add it back: 23 + 2 = 25
3.182 − 3 = 182 − 2 − (answer space) = (answer space)

Answer: 1, 179

  1. 182 − 2 = 180 (back to a ten)
  2. 180 − 1 = 179
4.165 + 49 = 165 + 50 − (answer space) = (answer space)

Answer: 1, 214

  1. 165 + 50 = 215
  2. 215 − 1 = 214
5.178 − 99 = 178 − 100 + (answer space) = (answer space)

Answer: 1, 79

  1. 178 − 100 = 78
  2. I took away 1 too many, so add it back: 78 + 1 = 79
6.144 − 5 = 144 − 4 − (answer space) = (answer space)

Answer: 1, 139

  1. 144 − 4 = 140 (back to a ten)
  2. 140 − 1 = 139
7.87 + 49 = 87 + 50 − (answer space) = (answer space)

Answer: 1, 136

  1. 87 + 50 = 137
  2. 137 − 1 = 136
8.97 − 18 = 97 − 20 + (answer space) = (answer space)

Answer: 2, 79

  1. 97 − 20 = 77
  2. I took away 2 too many, so add it back: 77 + 2 = 79
9.101 − 5 = 101 − 1 − (answer space) = (answer space)

Answer: 4, 96

  1. 101 − 1 = 100 (back to a ten)
  2. 100 − 4 = 96
10.35 + 38 = 35 + 40 − (answer space) = (answer space)

Answer: 2, 73

  1. 35 + 40 = 75
  2. 75 − 2 = 73
11.140 − 38 = 140 − 40 + (answer space) = (answer space)

Answer: 2, 102

  1. 140 − 40 = 100
  2. I took away 2 too many, so add it back: 100 + 2 = 102
12.81 − 8 = 81 − 1 − (answer space) = (answer space)

Answer: 7, 73

  1. 81 − 1 = 80 (back to a ten)
  2. 80 − 7 = 73
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