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Year 5 Mental Addition and Subtraction Strategies Worksheet — Level 3 — Practice Set 4 — 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 4 — Answers

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

1.165 + 29 = 165 + 30 − (answer space) = (answer space)

Answer: 1, 194

  1. 165 + 30 = 195
  2. 195 − 1 = 194
2.69 − 19 = 69 − 20 + (answer space) = (answer space)

Answer: 1, 50

  1. 69 − 20 = 49
  2. I took away 1 too many, so add it back: 49 + 1 = 50
3.91 − 6 = 91 − 1 − (answer space) = (answer space)

Answer: 5, 85

  1. 91 − 1 = 90 (back to a ten)
  2. 90 − 5 = 85
4.52 + 49 = 52 + 50 − (answer space) = (answer space)

Answer: 1, 101

  1. 52 + 50 = 102
  2. 102 − 1 = 101
5.181 − 98 = 181 − 100 + (answer space) = (answer space)

Answer: 2, 83

  1. 181 − 100 = 81
  2. I took away 2 too many, so add it back: 81 + 2 = 83
6.141 − 9 = 141 − 1 − (answer space) = (answer space)

Answer: 8, 132

  1. 141 − 1 = 140 (back to a ten)
  2. 140 − 8 = 132
7.73 + 38 = 73 + 40 − (answer space) = (answer space)

Answer: 2, 111

  1. 73 + 40 = 113
  2. 113 − 2 = 111
8.162 − 98 = 162 − 100 + (answer space) = (answer space)

Answer: 2, 64

  1. 162 − 100 = 62
  2. I took away 2 too many, so add it back: 62 + 2 = 64
9.71 − 3 = 71 − 1 − (answer space) = (answer space)

Answer: 2, 68

  1. 71 − 1 = 70 (back to a ten)
  2. 70 − 2 = 68
10.191 + 98 = 191 + 100 − (answer space) = (answer space)

Answer: 2, 289

  1. 191 + 100 = 291
  2. 291 − 2 = 289
11.50 − 19 = 50 − 20 + (answer space) = (answer space)

Answer: 1, 31

  1. 50 − 20 = 30
  2. I took away 1 too many, so add it back: 30 + 1 = 31
12.172 − 5 = 172 − 2 − (answer space) = (answer space)

Answer: 3, 167

  1. 172 − 2 = 170 (back to a ten)
  2. 170 − 3 = 167
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