Year 3 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Answers
Answer sheet with worked solutions for the Year 3 addition worksheet.
Success TutoringWorksheetsAnswer sheetYear 3 · Mathematics · AdditionYear 3 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Answers
Fill in each step of the strategy, then write the answer.
1.76 + 8 = 76 + 4 + (answer space) = (answer space)
Answer: 4, 84
- 76 + 4 = 80 (a ten)
- 80 + 4 = 84
2.27 + 9 = 27 + 10 − (answer space) = (answer space)
Answer: 1, 36
- 27 + 10 = 37
- 37 − 1 = 36
3.15 + 14 = (answer space) + (answer space) + 1 = (answer space)
Answer: 14, 14, 29
- Double 14 is 28
- 28 + 1 = 29
4.56 + 8 = 56 + 4 + (answer space) = (answer space)
Answer: 4, 64
- 56 + 4 = 60 (a ten)
- 60 + 4 = 64
5.30 + 9 = 30 + 10 − (answer space) = (answer space)
Answer: 1, 39
- 30 + 10 = 40
- 40 − 1 = 39
6.33 + 32 = (answer space) + (answer space) + 1 = (answer space)
Answer: 32, 32, 65
- Double 32 is 64
- 64 + 1 = 65
7.66 + 9 = 66 + 4 + (answer space) = (answer space)
Answer: 5, 75
- 66 + 4 = 70 (a ten)
- 70 + 5 = 75
8.48 + 9 = 48 + 10 − (answer space) = (answer space)
Answer: 1, 57
- 48 + 10 = 58
- 58 − 1 = 57
9.51 + 52 = (answer space) + (answer space) + 1 = (answer space)
Answer: 51, 51, 103
- Double 51 is 102
- 102 + 1 = 103
10.75 + 7 = 75 + 5 + (answer space) = (answer space)
Answer: 2, 82
- 75 + 5 = 80 (a ten)
- 80 + 2 = 82
11.47 + 9 = 47 + 10 − (answer space) = (answer space)
Answer: 1, 56
- 47 + 10 = 57
- 57 − 1 = 56
12.13 + 12 = (answer space) + (answer space) + 1 = (answer space)
Answer: 12, 12, 25
- Double 12 is 24
- 24 + 1 = 25
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.