Year 4 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Answers
Answer sheet with worked solutions for the Year 4 addition worksheet.
Success TutoringWorksheetsAnswer sheetYear 4 · Mathematics · AdditionYear 4 Mental Addition and Subtraction Strategies Worksheet — Level 2 — Answers
Fill in each step of the strategy, then write the answer.
1.59 + 2 = 59 + 1 + (answer space) = (answer space)
Answer: 1, 61
- 59 + 1 = 60 (a ten)
- 60 + 1 = 61
2.53 + 9 = 53 + 10 − (answer space) = (answer space)
Answer: 1, 62
- 53 + 10 = 63
- 63 − 1 = 62
3.64 + 63 = (answer space) + (answer space) + 1 = (answer space)
Answer: 63, 63, 127
- Double 63 is 126
- 126 + 1 = 127
4.57 + 8 = 57 + 3 + (answer space) = (answer space)
Answer: 5, 65
- 57 + 3 = 60 (a ten)
- 60 + 5 = 65
5.14 + 9 = 14 + 10 − (answer space) = (answer space)
Answer: 1, 23
- 14 + 10 = 24
- 24 − 1 = 23
6.28 + 27 = (answer space) + (answer space) + 1 = (answer space)
Answer: 27, 27, 55
- Double 27 is 54
- 54 + 1 = 55
7.56 + 8 = 56 + 4 + (answer space) = (answer space)
Answer: 4, 64
- 56 + 4 = 60 (a ten)
- 60 + 4 = 64
8.23 + 9 = 23 + 10 − (answer space) = (answer space)
Answer: 1, 32
- 23 + 10 = 33
- 33 − 1 = 32
9.81 + 80 = (answer space) + (answer space) + 1 = (answer space)
Answer: 80, 80, 161
- Double 80 is 160
- 160 + 1 = 161
10.37 + 4 = 37 + 3 + (answer space) = (answer space)
Answer: 1, 41
- 37 + 3 = 40 (a ten)
- 40 + 1 = 41
11.26 + 9 = 26 + 10 − (answer space) = (answer space)
Answer: 1, 35
- 26 + 10 = 36
- 36 − 1 = 35
12.71 + 70 = (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.