Year 4 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 2 — 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 2 — Answers
Fill in each step of the strategy, then write the answer.
1.85 + 7 = 85 + 5 + (answer space) = (answer space)
Answer: 2, 92
- 85 + 5 = 90 (a ten)
- 90 + 2 = 92
2.44 + 9 = 44 + 10 − (answer space) = (answer space)
Answer: 1, 53
- 44 + 10 = 54
- 54 − 1 = 53
3.16 + 17 = (answer space) + (answer space) + 1 = (answer space)
Answer: 16, 16, 33
- Double 16 is 32
- 32 + 1 = 33
4.58 + 4 = 58 + 2 + (answer space) = (answer space)
Answer: 2, 62
- 58 + 2 = 60 (a ten)
- 60 + 2 = 62
5.64 + 9 = 64 + 10 − (answer space) = (answer space)
Answer: 1, 73
- 64 + 10 = 74
- 74 − 1 = 73
6.52 + 53 = (answer space) + (answer space) + 1 = (answer space)
Answer: 52, 52, 105
- Double 52 is 104
- 104 + 1 = 105
7.77 + 6 = 77 + 3 + (answer space) = (answer space)
Answer: 3, 83
- 77 + 3 = 80 (a ten)
- 80 + 3 = 83
8.30 + 9 = 30 + 10 − (answer space) = (answer space)
Answer: 1, 39
- 30 + 10 = 40
- 40 − 1 = 39
9.21 + 22 = (answer space) + (answer space) + 1 = (answer space)
Answer: 21, 21, 43
- Double 21 is 42
- 42 + 1 = 43
10.28 + 6 = 28 + 2 + (answer space) = (answer space)
Answer: 4, 34
- 28 + 2 = 30 (a ten)
- 30 + 4 = 34
11.43 + 9 = 43 + 10 − (answer space) = (answer space)
Answer: 1, 52
- 43 + 10 = 53
- 53 − 1 = 52
12.53 + 54 = (answer space) + (answer space) + 1 = (answer space)
Answer: 53, 53, 107
- Double 53 is 106
- 106 + 1 = 107
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.