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Year 5 Mental Addition and Subtraction Strategies Worksheet — Level 3 — Practice Set 2 — Answers

Answer sheet with worked solutions for the Year 5 addition worksheet.

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Success TutoringWorksheetsAnswer sheetYear 5 · Mathematics · Addition

Year 5 Mental Addition and Subtraction Strategies Worksheet — Level 3 — Practice Set 2 — Answers

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

1.167 + 48 = 167 + 50 − (answer space) = (answer space)

Answer: 2, 215

  1. 167 + 50 = 217
  2. 217 − 2 = 215
2.119 − 48 = 119 − 50 + (answer space) = (answer space)

Answer: 2, 71

  1. 119 − 50 = 69
  2. I took away 2 too many, so add it back: 69 + 2 = 71
3.82 − 7 = 82 − 2 − (answer space) = (answer space)

Answer: 5, 75

  1. 82 − 2 = 80 (back to a ten)
  2. 80 − 5 = 75
4.108 + 18 = 108 + 20 − (answer space) = (answer space)

Answer: 2, 126

  1. 108 + 20 = 128
  2. 128 − 2 = 126
5.123 − 18 = 123 − 20 + (answer space) = (answer space)

Answer: 2, 105

  1. 123 − 20 = 103
  2. I took away 2 too many, so add it back: 103 + 2 = 105
6.62 − 8 = 62 − 2 − (answer space) = (answer space)

Answer: 6, 54

  1. 62 − 2 = 60 (back to a ten)
  2. 60 − 6 = 54
7.164 + 49 = 164 + 50 − (answer space) = (answer space)

Answer: 1, 213

  1. 164 + 50 = 214
  2. 214 − 1 = 213
8.105 − 39 = 105 − 40 + (answer space) = (answer space)

Answer: 1, 66

  1. 105 − 40 = 65
  2. I took away 1 too many, so add it back: 65 + 1 = 66
9.62 − 5 = 62 − 2 − (answer space) = (answer space)

Answer: 3, 57

  1. 62 − 2 = 60 (back to a ten)
  2. 60 − 3 = 57
10.103 + 48 = 103 + 50 − (answer space) = (answer space)

Answer: 2, 151

  1. 103 + 50 = 153
  2. 153 − 2 = 151
11.140 − 49 = 140 − 50 + (answer space) = (answer space)

Answer: 1, 91

  1. 140 − 50 = 90
  2. I took away 1 too many, so add it back: 90 + 1 = 91
12.123 − 5 = 123 − 3 − (answer space) = (answer space)

Answer: 2, 118

  1. 123 − 3 = 120 (back to a ten)
  2. 120 − 2 = 118
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