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) + 16 = 18
Answer: 2
- 18 − 16 = 2
2. (answer space) − 9 = 1
Answer: 10
- 1 + 9 = 10
3. (answer space) + 14 = 20
Answer: 6
- 20 − 14 = 6
4.4 + (answer space) = 6
Answer: 2
- 6 − 4 = 2
5. (answer space) + 4 = 13
Answer: 9
- 13 − 4 = 9
6. (answer space) − 3 = 9
Answer: 12
- 9 + 3 = 12
7.10 + (answer space) = 15
Answer: 5
- 15 − 10 = 5
8. (answer space) + 3 = 9
Answer: 6
- 9 − 3 = 6
9.11 + (answer space) = 18
Answer: 7
- 18 − 11 = 7
10. (answer space) + 1 = 10
Answer: 9
- 10 − 1 = 9
11.2 + (answer space) = 6
Answer: 4
- 6 − 2 = 4
12.7 − (answer space) = 3
Answer: 4
- 7 − 3 = 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.