Year 5 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 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 — Practice Set 2 — Answers
Fill in each step of the strategy, then write the answer.
1.89 + 8 = 89 + 1 + (answer space) = (answer space)
Answer: 7, 97
- 89 + 1 = 90 (a ten)
- 90 + 7 = 97
2.15 + 9 = 15 + 10 − (answer space) = (answer space)
Answer: 1, 24
- 15 + 10 = 25
- 25 − 1 = 24
3.39 + 38 = (answer space) + (answer space) + 1 = (answer space)
Answer: 38, 38, 77
- Double 38 is 76
- 76 + 1 = 77
4.87 + 8 = 87 + 3 + (answer space) = (answer space)
Answer: 5, 95
- 87 + 3 = 90 (a ten)
- 90 + 5 = 95
5.88 + 9 = 88 + 10 − (answer space) = (answer space)
Answer: 1, 97
- 88 + 10 = 98
- 98 − 1 = 97
6.28 + 29 = (answer space) + (answer space) + 1 = (answer space)
Answer: 28, 28, 57
- Double 28 is 56
- 56 + 1 = 57
7.46 + 7 = 46 + 4 + (answer space) = (answer space)
Answer: 3, 53
- 46 + 4 = 50 (a ten)
- 50 + 3 = 53
8.49 + 9 = 49 + 10 − (answer space) = (answer space)
Answer: 1, 58
- 49 + 10 = 59
- 59 − 1 = 58
9.31 + 30 = (answer space) + (answer space) + 1 = (answer space)
Answer: 30, 30, 61
- Double 30 is 60
- 60 + 1 = 61
10.29 + 5 = 29 + 1 + (answer space) = (answer space)
Answer: 4, 34
- 29 + 1 = 30 (a ten)
- 30 + 4 = 34
11.82 + 9 = 82 + 10 − (answer space) = (answer space)
Answer: 1, 91
- 82 + 10 = 92
- 92 − 1 = 91
12.46 + 45 = (answer space) + (answer space) + 1 = (answer space)
Answer: 45, 45, 91
- Double 45 is 90
- 90 + 1 = 91
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.