Year 1 Missing Numbers in Number Sentences Worksheet — Level 1 — 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 — Answers
Write the missing number. Use addition to check subtraction, and subtraction to check addition.
1. (answer space) + 2 = 10
Answer: 8
- 10 − 2 = 8
2.5 + (answer space) = 11
Answer: 6
- 11 − 5 = 6
3.17 − (answer space) = 4
Answer: 13
- 17 − 4 = 13
4.3 + (answer space) = 14
Answer: 11
- 14 − 3 = 11
5.12 + (answer space) = 14
Answer: 2
- 14 − 12 = 2
6.10 − (answer space) = 6
Answer: 4
- 10 − 6 = 4
7. (answer space) + 6 = 17
Answer: 11
- 17 − 6 = 11
8.19 − (answer space) = 16
Answer: 3
- 19 − 16 = 3
9.14 − (answer space) = 9
Answer: 5
- 14 − 9 = 5
10.4 + (answer space) = 7
Answer: 3
- 7 − 4 = 3
11.2 + (answer space) = 8
Answer: 6
- 8 − 2 = 6
12. (answer space) + 16 = 20
Answer: 4
- 20 − 16 = 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.