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

Answer sheet with worked solutions for the Year 3 addition worksheet.

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Success TutoringWorksheetsAnswer sheetYear 3 · Mathematics · Addition

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

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

1.127 + 9 = 127 + 10 − (answer space) = (answer space)

Answer: 1, 136

  1. 127 + 10 = 137
  2. 137 − 1 = 136
2.90 − 28 = 90 − 30 + (answer space) = (answer space)

Answer: 2, 62

  1. 90 − 30 = 60
  2. I took away 2 too many, so add it back: 60 + 2 = 62
3.44 − 7 = 44 − 4 − (answer space) = (answer space)

Answer: 3, 37

  1. 44 − 4 = 40 (back to a ten)
  2. 40 − 3 = 37
4.192 + 59 = 192 + 60 − (answer space) = (answer space)

Answer: 1, 251

  1. 192 + 60 = 252
  2. 252 − 1 = 251
5.117 − 29 = 117 − 30 + (answer space) = (answer space)

Answer: 1, 88

  1. 117 − 30 = 87
  2. I took away 1 too many, so add it back: 87 + 1 = 88
6.114 − 7 = 114 − 4 − (answer space) = (answer space)

Answer: 3, 107

  1. 114 − 4 = 110 (back to a ten)
  2. 110 − 3 = 107
7.69 + 9 = 69 + 10 − (answer space) = (answer space)

Answer: 1, 78

  1. 69 + 10 = 79
  2. 79 − 1 = 78
8.124 − 99 = 124 − 100 + (answer space) = (answer space)

Answer: 1, 25

  1. 124 − 100 = 24
  2. I took away 1 too many, so add it back: 24 + 1 = 25
9.53 − 9 = 53 − 3 − (answer space) = (answer space)

Answer: 6, 44

  1. 53 − 3 = 50 (back to a ten)
  2. 50 − 6 = 44
10.48 + 98 = 48 + 100 − (answer space) = (answer space)

Answer: 2, 146

  1. 48 + 100 = 148
  2. 148 − 2 = 146
11.66 − 49 = 66 − 50 + (answer space) = (answer space)

Answer: 1, 17

  1. 66 − 50 = 16
  2. I took away 1 too many, so add it back: 16 + 1 = 17
12.54 − 9 = 54 − 4 − (answer space) = (answer space)

Answer: 5, 45

  1. 54 − 4 = 50 (back to a ten)
  2. 50 − 5 = 45
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