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

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

1.174 + 38 = 174 + 40 − (answer space) = (answer space)

Answer: 2, 212

  1. 174 + 40 = 214
  2. 214 − 2 = 212
2.109 − 49 = 109 − 50 + (answer space) = (answer space)

Answer: 1, 60

  1. 109 − 50 = 59
  2. I took away 1 too many, so add it back: 59 + 1 = 60
3.143 − 6 = 143 − 3 − (answer space) = (answer space)

Answer: 3, 137

  1. 143 − 3 = 140 (back to a ten)
  2. 140 − 3 = 137
4.44 + 98 = 44 + 100 − (answer space) = (answer space)

Answer: 2, 142

  1. 44 + 100 = 144
  2. 144 − 2 = 142
5.41 − 29 = 41 − 30 + (answer space) = (answer space)

Answer: 1, 12

  1. 41 − 30 = 11
  2. I took away 1 too many, so add it back: 11 + 1 = 12
6.192 − 3 = 192 − 2 − (answer space) = (answer space)

Answer: 1, 189

  1. 192 − 2 = 190 (back to a ten)
  2. 190 − 1 = 189
7.88 + 39 = 88 + 40 − (answer space) = (answer space)

Answer: 1, 127

  1. 88 + 40 = 128
  2. 128 − 1 = 127
8.167 − 59 = 167 − 60 + (answer space) = (answer space)

Answer: 1, 108

  1. 167 − 60 = 107
  2. I took away 1 too many, so add it back: 107 + 1 = 108
9.132 − 7 = 132 − 2 − (answer space) = (answer space)

Answer: 5, 125

  1. 132 − 2 = 130 (back to a ten)
  2. 130 − 5 = 125
10.42 + 38 = 42 + 40 − (answer space) = (answer space)

Answer: 2, 80

  1. 42 + 40 = 82
  2. 82 − 2 = 80
11.152 − 38 = 152 − 40 + (answer space) = (answer space)

Answer: 2, 114

  1. 152 − 40 = 112
  2. I took away 2 too many, so add it back: 112 + 2 = 114
12.112 − 5 = 112 − 2 − (answer space) = (answer space)

Answer: 3, 107

  1. 112 − 2 = 110 (back to a ten)
  2. 110 − 3 = 107
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