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.
1.58 + 7 = 58 + 2 + (answer space) = (answer space)
Answer: 5, 65
- 58 + 2 = 60 (a ten)
- 60 + 5 = 65
2.28 + 9 = 28 + 10 − (answer space) = (answer space)
Answer: 1, 37
- 28 + 10 = 38
- 38 − 1 = 37
3.35 + 34 = (answer space) + (answer space) + 1 = (answer space)
Answer: 34, 34, 69
- Double 34 is 68
- 68 + 1 = 69
4.39 + 6 = 39 + 1 + (answer space) = (answer space)
Answer: 5, 45
- 39 + 1 = 40 (a ten)
- 40 + 5 = 45
5.53 + 9 = 53 + 10 − (answer space) = (answer space)
Answer: 1, 62
- 53 + 10 = 63
- 63 − 1 = 62
6.74 + 73 = (answer space) + (answer space) + 1 = (answer space)
Answer: 73, 73, 147
- Double 73 is 146
- 146 + 1 = 147
7.55 + 7 = 55 + 5 + (answer space) = (answer space)
Answer: 2, 62
- 55 + 5 = 60 (a ten)
- 60 + 2 = 62
8.76 + 9 = 76 + 10 − (answer space) = (answer space)
Answer: 1, 85
- 76 + 10 = 86
- 86 − 1 = 85
9.24 + 25 = (answer space) + (answer space) + 1 = (answer space)
Answer: 24, 24, 49
- Double 24 is 48
- 48 + 1 = 49
10.37 + 4 = 37 + 3 + (answer space) = (answer space)
Answer: 1, 41
- 37 + 3 = 40 (a ten)
- 40 + 1 = 41
11.33 + 9 = 33 + 10 − (answer space) = (answer space)
Answer: 1, 42
- 33 + 10 = 43
- 43 − 1 = 42
12.74 + 75 = (answer space) + (answer space) + 1 = (answer space)
Answer: 74, 74, 149
- Double 74 is 148
- 148 + 1 = 149
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.