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.
1.75 + 7 = 75 + 5 + (answer space) = (answer space)
Answer: 2, 82
- 75 + 5 = 80 (a ten)
- 80 + 2 = 82
2.70 + 9 = 70 + 10 − (answer space) = (answer space)
Answer: 1, 79
- 70 + 10 = 80
- 80 − 1 = 79
3.38 + 39 = (answer space) + (answer space) + 1 = (answer space)
Answer: 38, 38, 77
- Double 38 is 76
- 76 + 1 = 77
4.46 + 9 = 46 + 4 + (answer space) = (answer space)
Answer: 5, 55
- 46 + 4 = 50 (a ten)
- 50 + 5 = 55
5.31 + 9 = 31 + 10 − (answer space) = (answer space)
Answer: 1, 40
- 31 + 10 = 41
- 41 − 1 = 40
6.30 + 29 = (answer space) + (answer space) + 1 = (answer space)
Answer: 29, 29, 59
- Double 29 is 58
- 58 + 1 = 59
7.26 + 6 = 26 + 4 + (answer space) = (answer space)
Answer: 2, 32
- 26 + 4 = 30 (a ten)
- 30 + 2 = 32
8.35 + 9 = 35 + 10 − (answer space) = (answer space)
Answer: 1, 44
- 35 + 10 = 45
- 45 − 1 = 44
9.16 + 15 = (answer space) + (answer space) + 1 = (answer space)
Answer: 15, 15, 31
- Double 15 is 30
- 30 + 1 = 31
10.49 + 2 = 49 + 1 + (answer space) = (answer space)
Answer: 1, 51
- 49 + 1 = 50 (a ten)
- 50 + 1 = 51
11.77 + 9 = 77 + 10 − (answer space) = (answer space)
Answer: 1, 86
- 77 + 10 = 87
- 87 − 1 = 86
12.19 + 18 = (answer space) + (answer space) + 1 = (answer space)
Answer: 18, 18, 37
- Double 18 is 36
- 36 + 1 = 37
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.