Year 5 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 4 — 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 4 — Answers
Fill in each step of the strategy, then write the answer.
1.28 + 5 = 28 + 2 + (answer space) = (answer space)
Answer: 3, 33
- 28 + 2 = 30 (a ten)
- 30 + 3 = 33
2.35 + 9 = 35 + 10 − (answer space) = (answer space)
Answer: 1, 44
- 35 + 10 = 45
- 45 − 1 = 44
3.25 + 24 = (answer space) + (answer space) + 1 = (answer space)
Answer: 24, 24, 49
- Double 24 is 48
- 48 + 1 = 49
4.86 + 6 = 86 + 4 + (answer space) = (answer space)
Answer: 2, 92
- 86 + 4 = 90 (a ten)
- 90 + 2 = 92
5.81 + 9 = 81 + 10 − (answer space) = (answer space)
Answer: 1, 90
- 81 + 10 = 91
- 91 − 1 = 90
6.53 + 52 = (answer space) + (answer space) + 1 = (answer space)
Answer: 52, 52, 105
- Double 52 is 104
- 104 + 1 = 105
7.16 + 9 = 16 + 4 + (answer space) = (answer space)
Answer: 5, 25
- 16 + 4 = 20 (a ten)
- 20 + 5 = 25
8.53 + 9 = 53 + 10 − (answer space) = (answer space)
Answer: 1, 62
- 53 + 10 = 63
- 63 − 1 = 62
9.21 + 20 = (answer space) + (answer space) + 1 = (answer space)
Answer: 20, 20, 41
- Double 20 is 40
- 40 + 1 = 41
10.45 + 7 = 45 + 5 + (answer space) = (answer space)
Answer: 2, 52
- 45 + 5 = 50 (a ten)
- 50 + 2 = 52
11.47 + 9 = 47 + 10 − (answer space) = (answer space)
Answer: 1, 56
- 47 + 10 = 57
- 57 − 1 = 56
12.70 + 71 = (answer space) + (answer space) + 1 = (answer space)
Answer: 70, 70, 141
- Double 70 is 140
- 140 + 1 = 141
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.