Year 3 Missing Numbers in Number Sentences Worksheet — Level 1 — 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 — Answers
Write the missing number. Use addition to check subtraction, and subtraction to check addition.
1. (answer space) + 1 = 6
Answer: 5
- 6 − 1 = 5
2. (answer space) + 6 = 8
Answer: 2
- 8 − 6 = 2
3. (answer space) − 7 = 8
Answer: 15
- 8 + 7 = 15
4.4 + (answer space) = 9
Answer: 5
- 9 − 4 = 5
5. (answer space) − 10 = 5
Answer: 15
- 5 + 10 = 15
6.11 − (answer space) = 7
Answer: 4
- 11 − 7 = 4
7.15 + (answer space) = 16
Answer: 1
- 16 − 15 = 1
8. (answer space) − 12 = 7
Answer: 19
- 7 + 12 = 19
9.15 − (answer space) = 5
Answer: 10
- 15 − 5 = 10
10.5 + (answer space) = 8
Answer: 3
- 8 − 5 = 3
11. (answer space) − 19 = 1
Answer: 20
- 1 + 19 = 20
12. (answer space) + 4 = 11
Answer: 7
- 11 − 4 = 7
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.