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4th Grade Mental Addition and Subtraction Strategies Worksheet — Level 3 — Practice Set 2 — 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 2 — Answers

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

1.92 + 48 = 92 + 50 − (answer space) = (answer space)

Answer: 2, 140

  1. 92 + 50 = 142
  2. 142 − 2 = 140
2.98 − 39 = 98 − 40 + (answer space) = (answer space)

Answer: 1, 59

  1. 98 − 40 = 58
  2. I took away 1 too many, so add it back: 58 + 1 = 59
3.62 − 7 = 62 − 2 − (answer space) = (answer space)

Answer: 5, 55

  1. 62 − 2 = 60 (back to a ten)
  2. 60 − 5 = 55
4.87 + 39 = 87 + 40 − (answer space) = (answer space)

Answer: 1, 126

  1. 87 + 40 = 127
  2. 127 − 1 = 126
5.75 − 19 = 75 − 20 + (answer space) = (answer space)

Answer: 1, 56

  1. 75 − 20 = 55
  2. I took away 1 too many, so add it back: 55 + 1 = 56
6.174 − 5 = 174 − 4 − (answer space) = (answer space)

Answer: 1, 169

  1. 174 − 4 = 170 (back to a ten)
  2. 170 − 1 = 169
7.154 + 48 = 154 + 50 − (answer space) = (answer space)

Answer: 2, 202

  1. 154 + 50 = 204
  2. 204 − 2 = 202
8.92 − 28 = 92 − 30 + (answer space) = (answer space)

Answer: 2, 64

  1. 92 − 30 = 62
  2. I took away 2 too many, so add it back: 62 + 2 = 64
9.31 − 4 = 31 − 1 − (answer space) = (answer space)

Answer: 3, 27

  1. 31 − 1 = 30 (back to a ten)
  2. 30 − 3 = 27
10.121 + 99 = 121 + 100 − (answer space) = (answer space)

Answer: 1, 220

  1. 121 + 100 = 221
  2. 221 − 1 = 220
11.184 − 99 = 184 − 100 + (answer space) = (answer space)

Answer: 1, 85

  1. 184 − 100 = 84
  2. I took away 1 too many, so add it back: 84 + 1 = 85
12.152 − 6 = 152 − 2 − (answer space) = (answer space)

Answer: 4, 146

  1. 152 − 2 = 150 (back to a ten)
  2. 150 − 4 = 146
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