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) + 2 = 20
Answer: 18
- 20 − 2 = 18
2.3 + (answer space) = 12
Answer: 9
- 12 − 3 = 9
3. (answer space) − 6 = 3
Answer: 9
- 3 + 6 = 9
4. (answer space) + 3 = 11
Answer: 8
- 11 − 3 = 8
5. (answer space) − 6 = 1
Answer: 7
- 1 + 6 = 7
6.15 + (answer space) = 16
Answer: 1
- 16 − 15 = 1
7. (answer space) + 19 = 20
Answer: 1
- 20 − 19 = 1
8.16 − (answer space) = 9
Answer: 7
- 16 − 9 = 7
9. (answer space) − 5 = 6
Answer: 11
- 6 + 5 = 11
10. (answer space) − 10 = 1
Answer: 11
- 1 + 10 = 11
11.1 + (answer space) = 16
Answer: 15
- 16 − 1 = 15
12.15 − (answer space) = 9
Answer: 6
- 15 − 9 = 6
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.