Year 3 Missing Numbers in Number Sentences Worksheet — Level 1 — Practice Set 2 — 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 2 — Answers
Write the missing number. Use addition to check subtraction, and subtraction to check addition.
1.7 + (answer space) = 18
Answer: 11
- 18 − 7 = 11
2.13 − (answer space) = 5
Answer: 8
- 13 − 5 = 8
3.4 + (answer space) = 19
Answer: 15
- 19 − 4 = 15
4.10 + (answer space) = 12
Answer: 2
- 12 − 10 = 2
5. (answer space) − 6 = 8
Answer: 14
- 8 + 6 = 14
6. (answer space) + 7 = 11
Answer: 4
- 11 − 7 = 4
7.7 + (answer space) = 13
Answer: 6
- 13 − 7 = 6
8.14 − (answer space) = 7
Answer: 7
- 14 − 7 = 7
9.8 − (answer space) = 6
Answer: 2
- 8 − 6 = 2
10. (answer space) − 5 = 6
Answer: 11
- 6 + 5 = 11
11.13 − (answer space) = 10
Answer: 3
- 13 − 10 = 3
12. (answer space) + 7 = 15
Answer: 8
- 15 − 7 = 8
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.