Year 1 Missing Numbers in Number Sentences Worksheet — Level 1 — Practice Set 3 — Answers
Answer sheet with worked solutions for the Year 1 addition worksheet.
Success TutoringWorksheetsAnswer sheetYear 1 · Mathematics · AdditionYear 1 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) + 10 = 11
Answer: 1
- 11 − 10 = 1
2.9 − (answer space) = 8
Answer: 1
- 9 − 8 = 1
3.10 − (answer space) = 9
Answer: 1
- 10 − 9 = 1
4. (answer space) − 6 = 3
Answer: 9
- 3 + 6 = 9
5.4 + (answer space) = 6
Answer: 2
- 6 − 4 = 2
6.9 − (answer space) = 7
Answer: 2
- 9 − 7 = 2
7.15 + (answer space) = 19
Answer: 4
- 19 − 15 = 4
8. (answer space) + 4 = 13
Answer: 9
- 13 − 4 = 9
9. (answer space) + 6 = 10
Answer: 4
- 10 − 6 = 4
10. (answer space) + 5 = 10
Answer: 5
- 10 − 5 = 5
11. (answer space) − 4 = 2
Answer: 6
- 2 + 4 = 6
12. (answer space) − 4 = 7
Answer: 11
- 7 + 4 = 11
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.