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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.

1.26 + 98 = 26 + 100 − (answer space) = (answer space)

Answer: 2, 124

  1. 26 + 100 = 126
  2. 126 − 2 = 124
2.44 − 9 = 44 − 10 + (answer space) = (answer space)

Answer: 1, 35

  1. 44 − 10 = 34
  2. I took away 1 too many, so add it back: 34 + 1 = 35
3.52 − 8 = 52 − 2 − (answer space) = (answer space)

Answer: 6, 44

  1. 52 − 2 = 50 (back to a ten)
  2. 50 − 6 = 44
4.108 + 28 = 108 + 30 − (answer space) = (answer space)

Answer: 2, 136

  1. 108 + 30 = 138
  2. 138 − 2 = 136
5.146 − 49 = 146 − 50 + (answer space) = (answer space)

Answer: 1, 97

  1. 146 − 50 = 96
  2. I took away 1 too many, so add it back: 96 + 1 = 97
6.61 − 5 = 61 − 1 − (answer space) = (answer space)

Answer: 4, 56

  1. 61 − 1 = 60 (back to a ten)
  2. 60 − 4 = 56
7.57 + 38 = 57 + 40 − (answer space) = (answer space)

Answer: 2, 95

  1. 57 + 40 = 97
  2. 97 − 2 = 95
8.139 − 48 = 139 − 50 + (answer space) = (answer space)

Answer: 2, 91

  1. 139 − 50 = 89
  2. I took away 2 too many, so add it back: 89 + 2 = 91
9.134 − 6 = 134 − 4 − (answer space) = (answer space)

Answer: 2, 128

  1. 134 − 4 = 130 (back to a ten)
  2. 130 − 2 = 128
10.40 + 99 = 40 + 100 − (answer space) = (answer space)

Answer: 1, 139

  1. 40 + 100 = 140
  2. 140 − 1 = 139
11.85 − 9 = 85 − 10 + (answer space) = (answer space)

Answer: 1, 76

  1. 85 − 10 = 75
  2. I took away 1 too many, so add it back: 75 + 1 = 76
12.61 − 8 = 61 − 1 − (answer space) = (answer space)

Answer: 7, 53

  1. 61 − 1 = 60 (back to a ten)
  2. 60 − 7 = 53
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