Year 3 Missing Numbers in Number Sentences Worksheet — Level 1 — Practice Set 3 — 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 3 — Answers
Write the missing number. Use addition to check subtraction, and subtraction to check addition.
1. (answer space) − 9 = 10
Answer: 19
- 10 + 9 = 19
2.7 − (answer space) = 3
Answer: 4
- 7 − 3 = 4
3.17 − (answer space) = 15
Answer: 2
- 17 − 15 = 2
4.15 − (answer space) = 8
Answer: 7
- 15 − 8 = 7
5. (answer space) + 3 = 14
Answer: 11
- 14 − 3 = 11
6. (answer space) − 5 = 5
Answer: 10
- 5 + 5 = 10
7.11 + (answer space) = 16
Answer: 5
- 16 − 11 = 5
8. (answer space) − 4 = 1
Answer: 5
- 1 + 4 = 5
9. (answer space) + 2 = 12
Answer: 10
- 12 − 2 = 10
10. (answer space) − 4 = 12
Answer: 16
- 12 + 4 = 16
11. (answer space) − 3 = 13
Answer: 16
- 13 + 3 = 16
12.2 + (answer space) = 18
Answer: 16
- 18 − 2 = 16
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.