Year 2 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 4 — Answers
Answer sheet with worked solutions for the Year 2 addition worksheet.
Success TutoringWorksheetsAnswer sheetYear 2 · Mathematics · AdditionYear 2 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Practice Set 4 — Answers
Fill in each step of the strategy, then write the answer.
1.35 + 9 = 35 + 5 + (answer space) = (answer space)
Answer: 4, 44
- 35 + 5 = 40 (a ten)
- 40 + 4 = 44
2.54 + 9 = 54 + 10 − (answer space) = (answer space)
Answer: 1, 63
- 54 + 10 = 64
- 64 − 1 = 63
3.70 + 71 = (answer space) + (answer space) + 1 = (answer space)
Answer: 70, 70, 141
- Double 70 is 140
- 140 + 1 = 141
4.26 + 9 = 26 + 4 + (answer space) = (answer space)
Answer: 5, 35
- 26 + 4 = 30 (a ten)
- 30 + 5 = 35
5.85 + 9 = 85 + 10 − (answer space) = (answer space)
Answer: 1, 94
- 85 + 10 = 95
- 95 − 1 = 94
6.71 + 70 = (answer space) + (answer space) + 1 = (answer space)
Answer: 70, 70, 141
- Double 70 is 140
- 140 + 1 = 141
7.35 + 7 = 35 + 5 + (answer space) = (answer space)
Answer: 2, 42
- 35 + 5 = 40 (a ten)
- 40 + 2 = 42
8.48 + 9 = 48 + 10 − (answer space) = (answer space)
Answer: 1, 57
- 48 + 10 = 58
- 58 − 1 = 57
9.11 + 10 = (answer space) + (answer space) + 1 = (answer space)
Answer: 10, 10, 21
- Double 10 is 20
- 20 + 1 = 21
10.46 + 7 = 46 + 4 + (answer space) = (answer space)
Answer: 3, 53
- 46 + 4 = 50 (a ten)
- 50 + 3 = 53
11.88 + 9 = 88 + 10 − (answer space) = (answer space)
Answer: 1, 97
- 88 + 10 = 98
- 98 − 1 = 97
12.52 + 53 = (answer space) + (answer space) + 1 = (answer space)
Answer: 52, 52, 105
- Double 52 is 104
- 104 + 1 = 105
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.