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

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

1.130 + 99 = 130 + 100 − (answer space) = (answer space)

Answer: 1, 229

  1. 130 + 100 = 230
  2. 230 − 1 = 229
2.58 − 19 = 58 − 20 + (answer space) = (answer space)

Answer: 1, 39

  1. 58 − 20 = 38
  2. I took away 1 too many, so add it back: 38 + 1 = 39
3.184 − 9 = 184 − 4 − (answer space) = (answer space)

Answer: 5, 175

  1. 184 − 4 = 180 (back to a ten)
  2. 180 − 5 = 175
4.192 + 38 = 192 + 40 − (answer space) = (answer space)

Answer: 2, 230

  1. 192 + 40 = 232
  2. 232 − 2 = 230
5.131 − 99 = 131 − 100 + (answer space) = (answer space)

Answer: 1, 32

  1. 131 − 100 = 31
  2. I took away 1 too many, so add it back: 31 + 1 = 32
6.51 − 8 = 51 − 1 − (answer space) = (answer space)

Answer: 7, 43

  1. 51 − 1 = 50 (back to a ten)
  2. 50 − 7 = 43
7.166 + 9 = 166 + 10 − (answer space) = (answer space)

Answer: 1, 175

  1. 166 + 10 = 176
  2. 176 − 1 = 175
8.205 − 99 = 205 − 100 + (answer space) = (answer space)

Answer: 1, 106

  1. 205 − 100 = 105
  2. I took away 1 too many, so add it back: 105 + 1 = 106
9.183 − 5 = 183 − 3 − (answer space) = (answer space)

Answer: 2, 178

  1. 183 − 3 = 180 (back to a ten)
  2. 180 − 2 = 178
10.155 + 9 = 155 + 10 − (answer space) = (answer space)

Answer: 1, 164

  1. 155 + 10 = 165
  2. 165 − 1 = 164
11.122 − 49 = 122 − 50 + (answer space) = (answer space)

Answer: 1, 73

  1. 122 − 50 = 72
  2. I took away 1 too many, so add it back: 72 + 1 = 73
12.181 − 8 = 181 − 1 − (answer space) = (answer space)

Answer: 7, 173

  1. 181 − 1 = 180 (back to a ten)
  2. 180 − 7 = 173
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