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

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

1.137 + 48 = 137 + 50 − (answer space) = (answer space)

Answer: 2, 185

  1. 137 + 50 = 187
  2. 187 − 2 = 185
2.181 − 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
3.162 − 4 = 162 − 2 − (answer space) = (answer space)

Answer: 2, 158

  1. 162 − 2 = 160 (back to a ten)
  2. 160 − 2 = 158
4.57 + 29 = 57 + 30 − (answer space) = (answer space)

Answer: 1, 86

  1. 57 + 30 = 87
  2. 87 − 1 = 86
5.179 − 98 = 179 − 100 + (answer space) = (answer space)

Answer: 2, 81

  1. 179 − 100 = 79
  2. I took away 2 too many, so add it back: 79 + 2 = 81
6.44 − 9 = 44 − 4 − (answer space) = (answer space)

Answer: 5, 35

  1. 44 − 4 = 40 (back to a ten)
  2. 40 − 5 = 35
7.151 + 28 = 151 + 30 − (answer space) = (answer space)

Answer: 2, 179

  1. 151 + 30 = 181
  2. 181 − 2 = 179
8.86 − 38 = 86 − 40 + (answer space) = (answer space)

Answer: 2, 48

  1. 86 − 40 = 46
  2. I took away 2 too many, so add it back: 46 + 2 = 48
9.142 − 5 = 142 − 2 − (answer space) = (answer space)

Answer: 3, 137

  1. 142 − 2 = 140 (back to a ten)
  2. 140 − 3 = 137
10.192 + 38 = 192 + 40 − (answer space) = (answer space)

Answer: 2, 230

  1. 192 + 40 = 232
  2. 232 − 2 = 230
11.197 − 98 = 197 − 100 + (answer space) = (answer space)

Answer: 2, 99

  1. 197 − 100 = 97
  2. I took away 2 too many, so add it back: 97 + 2 = 99
12.181 − 6 = 181 − 1 − (answer space) = (answer space)

Answer: 5, 175

  1. 181 − 1 = 180 (back to a ten)
  2. 180 − 5 = 175
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