Year 5 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 3 — 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 3 — Answers
Fill in each step of the strategy, then write the answer.
1.29 + 6 = 29 + 1 + (answer space) = (answer space)
Answer: 5, 35
- 29 + 1 = 30 (a ten)
- 30 + 5 = 35
2.56 + 9 = 56 + 10 − (answer space) = (answer space)
Answer: 1, 65
- 56 + 10 = 66
- 66 − 1 = 65
3.71 + 72 = (answer space) + (answer space) + 1 = (answer space)
Answer: 71, 71, 143
- Double 71 is 142
- 142 + 1 = 143
4.25 + 7 = 25 + 5 + (answer space) = (answer space)
Answer: 2, 32
- 25 + 5 = 30 (a ten)
- 30 + 2 = 32
5.33 + 9 = 33 + 10 − (answer space) = (answer space)
Answer: 1, 42
- 33 + 10 = 43
- 43 − 1 = 42
6.62 + 61 = (answer space) + (answer space) + 1 = (answer space)
Answer: 61, 61, 123
- Double 61 is 122
- 122 + 1 = 123
7.57 + 7 = 57 + 3 + (answer space) = (answer space)
Answer: 4, 64
- 57 + 3 = 60 (a ten)
- 60 + 4 = 64
8.55 + 9 = 55 + 10 − (answer space) = (answer space)
Answer: 1, 64
- 55 + 10 = 65
- 65 − 1 = 64
9.23 + 22 = (answer space) + (answer space) + 1 = (answer space)
Answer: 22, 22, 45
- Double 22 is 44
- 44 + 1 = 45
10.75 + 6 = 75 + 5 + (answer space) = (answer space)
Answer: 1, 81
- 75 + 5 = 80 (a ten)
- 80 + 1 = 81
11.62 + 9 = 62 + 10 − (answer space) = (answer space)
Answer: 1, 71
- 62 + 10 = 72
- 72 − 1 = 71
12.22 + 23 = (answer space) + (answer space) + 1 = (answer space)
Answer: 22, 22, 45
- Double 22 is 44
- 44 + 1 = 45
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.