Year 5 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Answers
Answer sheet with worked solutions for the Year 5 addition worksheet.
Success TutoringWorksheetsAnswer sheetYear 5 · Mathematics · AdditionYear 5 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Answers
Fill in each step of the strategy, then write the answer.
1.25 + 6 = 25 + 5 + (answer space) = (answer space)
Answer: 1, 31
- 25 + 5 = 30 (a ten)
- 30 + 1 = 31
2.22 + 9 = 22 + 10 − (answer space) = (answer space)
Answer: 1, 31
- 22 + 10 = 32
- 32 − 1 = 31
3.18 + 19 = (answer space) + (answer space) + 1 = (answer space)
Answer: 18, 18, 37
- Double 18 is 36
- 36 + 1 = 37
4.85 + 6 = 85 + 5 + (answer space) = (answer space)
Answer: 1, 91
- 85 + 5 = 90 (a ten)
- 90 + 1 = 91
5.68 + 9 = 68 + 10 − (answer space) = (answer space)
Answer: 1, 77
- 68 + 10 = 78
- 78 − 1 = 77
6.43 + 42 = (answer space) + (answer space) + 1 = (answer space)
Answer: 42, 42, 85
- Double 42 is 84
- 84 + 1 = 85
7.27 + 7 = 27 + 3 + (answer space) = (answer space)
Answer: 4, 34
- 27 + 3 = 30 (a ten)
- 30 + 4 = 34
8.63 + 9 = 63 + 10 − (answer space) = (answer space)
Answer: 1, 72
- 63 + 10 = 73
- 73 − 1 = 72
9.35 + 34 = (answer space) + (answer space) + 1 = (answer space)
Answer: 34, 34, 69
- Double 34 is 68
- 68 + 1 = 69
10.58 + 8 = 58 + 2 + (answer space) = (answer space)
Answer: 6, 66
- 58 + 2 = 60 (a ten)
- 60 + 6 = 66
11.57 + 9 = 57 + 10 − (answer space) = (answer space)
Answer: 1, 66
- 57 + 10 = 67
- 67 − 1 = 66
12.50 + 51 = (answer space) + (answer space) + 1 = (answer space)
Answer: 50, 50, 101
- Double 50 is 100
- 100 + 1 = 101
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.