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

Answer sheet with worked solutions for the Year 4 addition worksheet.

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Success TutoringWorksheetsAnswer sheetYear 4 · Mathematics · Addition

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

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

1.29 + 59 = 29 + 60 − (answer space) = (answer space)

Answer: 1, 88

  1. 29 + 60 = 89
  2. 89 − 1 = 88
2.96 − 38 = 96 − 40 + (answer space) = (answer space)

Answer: 2, 58

  1. 96 − 40 = 56
  2. I took away 2 too many, so add it back: 56 + 2 = 58
3.23 − 6 = 23 − 3 − (answer space) = (answer space)

Answer: 3, 17

  1. 23 − 3 = 20 (back to a ten)
  2. 20 − 3 = 17
4.78 + 38 = 78 + 40 − (answer space) = (answer space)

Answer: 2, 116

  1. 78 + 40 = 118
  2. 118 − 2 = 116
5.137 − 99 = 137 − 100 + (answer space) = (answer space)

Answer: 1, 38

  1. 137 − 100 = 37
  2. I took away 1 too many, so add it back: 37 + 1 = 38
6.121 − 5 = 121 − 1 − (answer space) = (answer space)

Answer: 4, 116

  1. 121 − 1 = 120 (back to a ten)
  2. 120 − 4 = 116
7.62 + 48 = 62 + 50 − (answer space) = (answer space)

Answer: 2, 110

  1. 62 + 50 = 112
  2. 112 − 2 = 110
8.161 − 98 = 161 − 100 + (answer space) = (answer space)

Answer: 2, 63

  1. 161 − 100 = 61
  2. I took away 2 too many, so add it back: 61 + 2 = 63
9.102 − 7 = 102 − 2 − (answer space) = (answer space)

Answer: 5, 95

  1. 102 − 2 = 100 (back to a ten)
  2. 100 − 5 = 95
10.186 + 38 = 186 + 40 − (answer space) = (answer space)

Answer: 2, 224

  1. 186 + 40 = 226
  2. 226 − 2 = 224
11.218 − 99 = 218 − 100 + (answer space) = (answer space)

Answer: 1, 119

  1. 218 − 100 = 118
  2. I took away 1 too many, so add it back: 118 + 1 = 119
12.62 − 6 = 62 − 2 − (answer space) = (answer space)

Answer: 4, 56

  1. 62 − 2 = 60 (back to a ten)
  2. 60 − 4 = 56
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