Year 4 Mental Addition and Subtraction Strategies Worksheet — Level 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 — Answers
Fill in each step of the strategy, then write the answer.
1.28 + 6 = 28 + 2 + (answer space) = (answer space)
Answer: 4, 34
- 28 + 2 = 30 (a ten)
- 30 + 4 = 34
2.32 + 9 = 32 + 10 − (answer space) = (answer space)
Answer: 1, 41
- 32 + 10 = 42
- 42 − 1 = 41
3.17 + 18 = (answer space) + (answer space) + 1 = (answer space)
Answer: 17, 17, 35
- Double 17 is 34
- 34 + 1 = 35
4.88 + 5 = 88 + 2 + (answer space) = (answer space)
Answer: 3, 93
- 88 + 2 = 90 (a ten)
- 90 + 3 = 93
5.37 + 9 = 37 + 10 − (answer space) = (answer space)
Answer: 1, 46
- 37 + 10 = 47
- 47 − 1 = 46
6.45 + 46 = (answer space) + (answer space) + 1 = (answer space)
Answer: 45, 45, 91
- Double 45 is 90
- 90 + 1 = 91
7.65 + 9 = 65 + 5 + (answer space) = (answer space)
Answer: 4, 74
- 65 + 5 = 70 (a ten)
- 70 + 4 = 74
8.78 + 9 = 78 + 10 − (answer space) = (answer space)
Answer: 1, 87
- 78 + 10 = 88
- 88 − 1 = 87
9.50 + 51 = (answer space) + (answer space) + 1 = (answer space)
Answer: 50, 50, 101
- Double 50 is 100
- 100 + 1 = 101
10.85 + 8 = 85 + 5 + (answer space) = (answer space)
Answer: 3, 93
- 85 + 5 = 90 (a ten)
- 90 + 3 = 93
11.57 + 9 = 57 + 10 − (answer space) = (answer space)
Answer: 1, 66
- 57 + 10 = 67
- 67 − 1 = 66
12.27 + 26 = (answer space) + (answer space) + 1 = (answer space)
Answer: 26, 26, 53
- Double 26 is 52
- 52 + 1 = 53
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.