Year 4 Mental Addition and Subtraction Strategies Worksheet — Level 1 — Practice Set 3 — 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 1 — Practice Set 3 — Answers
Fill in each step of the strategy, then write the answer.
1.8 + 7 = 8 + 2 + (answer space) = (answer space)
Answer: 5, 15
- 8 + 2 = 10 (a ten)
- 10 + 5 = 15
2.8 + 9 = 8 + 2 + (answer space) = (answer space)
Answer: 7, 17
- 8 + 2 = 10 (a ten)
- 10 + 7 = 17
3.6 + 5 = (answer space) + (answer space) + 1 = (answer space)
Answer: 5, 5, 11
- Double 5 is 10
- 10 + 1 = 11
4.9 + 9 = 9 + 1 + (answer space) = (answer space)
Answer: 8, 18
- 9 + 1 = 10 (a ten)
- 10 + 8 = 18
5.6 + 9 = 6 + 4 + (answer space) = (answer space)
Answer: 5, 15
- 6 + 4 = 10 (a ten)
- 10 + 5 = 15
6.3 + 4 = (answer space) + (answer space) + 1 = (answer space)
Answer: 3, 3, 7
- Double 3 is 6
- 6 + 1 = 7
7.6 + 8 = 6 + 4 + (answer space) = (answer space)
Answer: 4, 14
- 6 + 4 = 10 (a ten)
- 10 + 4 = 14
8.7 + 8 = 7 + 3 + (answer space) = (answer space)
Answer: 5, 15
- 7 + 3 = 10 (a ten)
- 10 + 5 = 15
9.4 + 3 = (answer space) + (answer space) + 1 = (answer space)
Answer: 3, 3, 7
- Double 3 is 6
- 6 + 1 = 7
10.9 + 4 = 9 + 1 + (answer space) = (answer space)
Answer: 3, 13
- 9 + 1 = 10 (a ten)
- 10 + 3 = 13
11.6 + 7 = 6 + 4 + (answer space) = (answer space)
Answer: 3, 13
- 6 + 4 = 10 (a ten)
- 10 + 3 = 13
12.7 + 8 = (answer space) + (answer space) + 1 = (answer space)
Answer: 7, 7, 15
- Double 7 is 14
- 14 + 1 = 15
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.