Year 3 Missing Numbers in Number Sentences Worksheet — Level 1 — Practice Set 4 — Answers
Answer sheet with worked solutions for the Year 3 addition worksheet.
Success TutoringWorksheetsAnswer sheetYear 3 · Mathematics · AdditionYear 3 Missing Numbers in Number Sentences Worksheet — Level 1 — Practice Set 4 — Answers
Write the missing number. Use addition to check subtraction, and subtraction to check addition.
1. (answer space) + 10 = 12
Answer: 2
- 12 − 10 = 2
2. (answer space) − 11 = 3
Answer: 14
- 3 + 11 = 14
3.2 + (answer space) = 9
Answer: 7
- 9 − 2 = 7
4. (answer space) − 4 = 2
Answer: 6
- 2 + 4 = 6
5.8 − (answer space) = 3
Answer: 5
- 8 − 3 = 5
6. (answer space) − 5 = 4
Answer: 9
- 4 + 5 = 9
7. (answer space) + 3 = 8
Answer: 5
- 8 − 3 = 5
8. (answer space) − 5 = 3
Answer: 8
- 3 + 5 = 8
9.8 − (answer space) = 6
Answer: 2
- 8 − 6 = 2
10.15 − (answer space) = 13
Answer: 2
- 15 − 13 = 2
11. (answer space) + 8 = 9
Answer: 1
- 9 − 8 = 1
12. (answer space) + 4 = 6
Answer: 2
- 6 − 4 = 2
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.