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.
1.3 + (answer space) = 16
Answer: 13
- 16 − 3 = 13
2.7 + (answer space) = 17
Answer: 10
- 17 − 7 = 10
3.14 − (answer space) = 3
Answer: 11
- 14 − 3 = 11
4.15 − (answer space) = 5
Answer: 10
- 15 − 5 = 10
5. (answer space) + 6 = 15
Answer: 9
- 15 − 6 = 9
6. (answer space) + 1 = 7
Answer: 6
- 7 − 1 = 6
7.15 − (answer space) = 10
Answer: 5
- 15 − 10 = 5
8.12 − (answer space) = 8
Answer: 4
- 12 − 8 = 4
9. (answer space) + 1 = 14
Answer: 13
- 14 − 1 = 13
10.13 + (answer space) = 15
Answer: 2
- 15 − 13 = 2
11.13 − (answer space) = 8
Answer: 5
- 13 − 8 = 5
12.5 + (answer space) = 14
Answer: 9
- 14 − 5 = 9
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.