Year 4 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 3 — Answers
Answer sheet with worked solutions for the Year 4 addition worksheet.
Success TutoringWorksheetsAnswer sheetYear 4 · Mathematics · AdditionYear 4 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 3 — Answers
Fill in each step of the strategy, then write the answer.
1.88 + 7 = 88 + 2 + (answer space) = (answer space)
Answer: 5, 95
- 88 + 2 = 90 (a ten)
- 90 + 5 = 95
2.26 + 9 = 26 + 10 − (answer space) = (answer space)
Answer: 1, 35
- 26 + 10 = 36
- 36 − 1 = 35
3.74 + 73 = (answer space) + (answer space) + 1 = (answer space)
Answer: 73, 73, 147
- Double 73 is 146
- 146 + 1 = 147
4.67 + 8 = 67 + 3 + (answer space) = (answer space)
Answer: 5, 75
- 67 + 3 = 70 (a ten)
- 70 + 5 = 75
5.72 + 9 = 72 + 10 − (answer space) = (answer space)
Answer: 1, 81
- 72 + 10 = 82
- 82 − 1 = 81
6.51 + 52 = (answer space) + (answer space) + 1 = (answer space)
Answer: 51, 51, 103
- Double 51 is 102
- 102 + 1 = 103
7.36 + 9 = 36 + 4 + (answer space) = (answer space)
Answer: 5, 45
- 36 + 4 = 40 (a ten)
- 40 + 5 = 45
8.65 + 9 = 65 + 10 − (answer space) = (answer space)
Answer: 1, 74
- 65 + 10 = 75
- 75 − 1 = 74
9.30 + 31 = (answer space) + (answer space) + 1 = (answer space)
Answer: 30, 30, 61
- Double 30 is 60
- 60 + 1 = 61
10.26 + 6 = 26 + 4 + (answer space) = (answer space)
Answer: 2, 32
- 26 + 4 = 30 (a ten)
- 30 + 2 = 32
11.51 + 9 = 51 + 10 − (answer space) = (answer space)
Answer: 1, 60
- 51 + 10 = 61
- 61 − 1 = 60
12.36 + 37 = (answer space) + (answer space) + 1 = (answer space)
Answer: 36, 36, 73
- Double 36 is 72
- 72 + 1 = 73
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.