Success TutoringWorksheets

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.

Download answers PDFPrint answersBack to worksheet
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.

1.86 + 38 = 86 + 40 − (answer space) = (answer space)

Answer: 2, 124

  1. 86 + 40 = 126
  2. 126 − 2 = 124
2.50 − 19 = 50 − 20 + (answer space) = (answer space)

Answer: 1, 31

  1. 50 − 20 = 30
  2. I took away 1 too many, so add it back: 30 + 1 = 31
3.191 − 6 = 191 − 1 − (answer space) = (answer space)

Answer: 5, 185

  1. 191 − 1 = 190 (back to a ten)
  2. 190 − 5 = 185
4.48 + 59 = 48 + 60 − (answer space) = (answer space)

Answer: 1, 107

  1. 48 + 60 = 108
  2. 108 − 1 = 107
5.67 − 28 = 67 − 30 + (answer space) = (answer space)

Answer: 2, 39

  1. 67 − 30 = 37
  2. I took away 2 too many, so add it back: 37 + 2 = 39
6.31 − 6 = 31 − 1 − (answer space) = (answer space)

Answer: 5, 25

  1. 31 − 1 = 30 (back to a ten)
  2. 30 − 5 = 25
7.191 + 29 = 191 + 30 − (answer space) = (answer space)

Answer: 1, 220

  1. 191 + 30 = 221
  2. 221 − 1 = 220
8.77 − 28 = 77 − 30 + (answer space) = (answer space)

Answer: 2, 49

  1. 77 − 30 = 47
  2. I took away 2 too many, so add it back: 47 + 2 = 49
9.54 − 7 = 54 − 4 − (answer space) = (answer space)

Answer: 3, 47

  1. 54 − 4 = 50 (back to a ten)
  2. 50 − 3 = 47
10.97 + 29 = 97 + 30 − (answer space) = (answer space)

Answer: 1, 126

  1. 97 + 30 = 127
  2. 127 − 1 = 126
11.127 − 38 = 127 − 40 + (answer space) = (answer space)

Answer: 2, 89

  1. 127 − 40 = 87
  2. I took away 2 too many, so add it back: 87 + 2 = 89
12.111 − 4 = 111 − 1 − (answer space) = (answer space)

Answer: 3, 107

  1. 111 − 1 = 110 (back to a ten)
  2. 110 − 3 = 107
Free worksheets at worksheets.successtutoring.com · © Success Tutoring · Free for personal and classroom use

Marking tips

  • Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
  • For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
  • Celebrate what went well first, then pick one thing to work on next.

Great work. Here's what to try next: