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4th Grade Mental Addition and Subtraction Strategies Worksheet — Level 3 — Answers

Answer sheet with worked solutions for the 4th Grade addition worksheet.

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Success TutoringWorksheetsAnswer sheet4th Grade · Mathematics · Addition

4th Grade Mental Addition and Subtraction Strategies Worksheet — Level 3 — Answers

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

1.43 + 38 = 43 + 40 − (answer space) = (answer space)

Answer: 2, 81

  1. 43 + 40 = 83
  2. 83 − 2 = 81
2.120 − 59 = 120 − 60 + (answer space) = (answer space)

Answer: 1, 61

  1. 120 − 60 = 60
  2. I took away 1 too many, so add it back: 60 + 1 = 61
3.112 − 5 = 112 − 2 − (answer space) = (answer space)

Answer: 3, 107

  1. 112 − 2 = 110 (back to a ten)
  2. 110 − 3 = 107
4.76 + 19 = 76 + 20 − (answer space) = (answer space)

Answer: 1, 95

  1. 76 + 20 = 96
  2. 96 − 1 = 95
5.165 − 99 = 165 − 100 + (answer space) = (answer space)

Answer: 1, 66

  1. 165 − 100 = 65
  2. I took away 1 too many, so add it back: 65 + 1 = 66
6.162 − 5 = 162 − 2 − (answer space) = (answer space)

Answer: 3, 157

  1. 162 − 2 = 160 (back to a ten)
  2. 160 − 3 = 157
7.32 + 9 = 32 + 10 − (answer space) = (answer space)

Answer: 1, 41

  1. 32 + 10 = 42
  2. 42 − 1 = 41
8.70 − 9 = 70 − 10 + (answer space) = (answer space)

Answer: 1, 61

  1. 70 − 10 = 60
  2. I took away 1 too many, so add it back: 60 + 1 = 61
9.192 − 4 = 192 − 2 − (answer space) = (answer space)

Answer: 2, 188

  1. 192 − 2 = 190 (back to a ten)
  2. 190 − 2 = 188
10.26 + 59 = 26 + 60 − (answer space) = (answer space)

Answer: 1, 85

  1. 26 + 60 = 86
  2. 86 − 1 = 85
11.89 − 19 = 89 − 20 + (answer space) = (answer space)

Answer: 1, 70

  1. 89 − 20 = 69
  2. I took away 1 too many, so add it back: 69 + 1 = 70
12.52 − 7 = 52 − 2 − (answer space) = (answer space)

Answer: 5, 45

  1. 52 − 2 = 50 (back to a ten)
  2. 50 − 5 = 45
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