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

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

1.56 + 19 = 56 + 20 − (answer space) = (answer space)

Answer: 1, 75

  1. 56 + 20 = 76
  2. 76 − 1 = 75
2.86 − 49 = 86 − 50 + (answer space) = (answer space)

Answer: 1, 37

  1. 86 − 50 = 36
  2. I took away 1 too many, so add it back: 36 + 1 = 37
3.61 − 8 = 61 − 1 − (answer space) = (answer space)

Answer: 7, 53

  1. 61 − 1 = 60 (back to a ten)
  2. 60 − 7 = 53
4.145 + 39 = 145 + 40 − (answer space) = (answer space)

Answer: 1, 184

  1. 145 + 40 = 185
  2. 185 − 1 = 184
5.75 − 48 = 75 − 50 + (answer space) = (answer space)

Answer: 2, 27

  1. 75 − 50 = 25
  2. I took away 2 too many, so add it back: 25 + 2 = 27
6.23 − 7 = 23 − 3 − (answer space) = (answer space)

Answer: 4, 16

  1. 23 − 3 = 20 (back to a ten)
  2. 20 − 4 = 16
7.134 + 99 = 134 + 100 − (answer space) = (answer space)

Answer: 1, 233

  1. 134 + 100 = 234
  2. 234 − 1 = 233
8.97 − 28 = 97 − 30 + (answer space) = (answer space)

Answer: 2, 69

  1. 97 − 30 = 67
  2. I took away 2 too many, so add it back: 67 + 2 = 69
9.194 − 9 = 194 − 4 − (answer space) = (answer space)

Answer: 5, 185

  1. 194 − 4 = 190 (back to a ten)
  2. 190 − 5 = 185
10.63 + 29 = 63 + 30 − (answer space) = (answer space)

Answer: 1, 92

  1. 63 + 30 = 93
  2. 93 − 1 = 92
11.161 − 48 = 161 − 50 + (answer space) = (answer space)

Answer: 2, 113

  1. 161 − 50 = 111
  2. I took away 2 too many, so add it back: 111 + 2 = 113
12.104 − 9 = 104 − 4 − (answer space) = (answer space)

Answer: 5, 95

  1. 104 − 4 = 100 (back to a ten)
  2. 100 − 5 = 95
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