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.
1.13 − (answer space) = 3
Answer: 10
- 13 − 3 = 10
2.1 + (answer space) = 14
Answer: 13
- 14 − 1 = 13
3. (answer space) − 5 = 2
Answer: 7
- 2 + 5 = 7
4. (answer space) + 3 = 19
Answer: 16
- 19 − 3 = 16
5.4 + (answer space) = 9
Answer: 5
- 9 − 4 = 5
6. (answer space) + 10 = 16
Answer: 6
- 16 − 10 = 6
7. (answer space) + 3 = 15
Answer: 12
- 15 − 3 = 12
8. (answer space) − 3 = 10
Answer: 13
- 10 + 3 = 13
9. (answer space) − 10 = 2
Answer: 12
- 2 + 10 = 12
10.9 + (answer space) = 10
Answer: 1
- 10 − 9 = 1
11.6 − (answer space) = 2
Answer: 4
- 6 − 2 = 4
12. (answer space) + 14 = 18
Answer: 4
- 18 − 14 = 4
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.