Year 1 Missing Numbers in Number Sentences Worksheet — Level 1 — Practice Set 2 — 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 2 — Answers
Write the missing number. Use addition to check subtraction, and subtraction to check addition.
1.4 + (answer space) = 8
Answer: 4
- 8 − 4 = 4
2. (answer space) − 4 = 8
Answer: 12
- 8 + 4 = 12
3. (answer space) + 1 = 5
Answer: 4
- 5 − 1 = 4
4.1 + (answer space) = 9
Answer: 8
- 9 − 1 = 8
5. (answer space) + 3 = 13
Answer: 10
- 13 − 3 = 10
6. (answer space) − 17 = 2
Answer: 19
- 2 + 17 = 19
7. (answer space) − 3 = 8
Answer: 11
- 8 + 3 = 11
8. (answer space) − 3 = 12
Answer: 15
- 12 + 3 = 15
9. (answer space) + 3 = 7
Answer: 4
- 7 − 3 = 4
10. (answer space) + 10 = 13
Answer: 3
- 13 − 10 = 3
11. (answer space) − 6 = 11
Answer: 17
- 11 + 6 = 17
12.16 − (answer space) = 10
Answer: 6
- 16 − 10 = 6
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.
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