Year 3 Missing Numbers in Number Sentences Worksheet — Level 2 — 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 2 — Practice Set 3 — Answers
Write the missing number. Use addition to check subtraction, and subtraction to check addition.
1.2 + (answer space) = 30
Answer: 28
- 30 − 2 = 28
2. (answer space) − 20 = 41
Answer: 61
- 41 + 20 = 61
3.61 − (answer space) = 28
Answer: 33
- 61 − 28 = 33
4.30 − (answer space) = 19
Answer: 11
- 30 − 19 = 11
5.12 + (answer space) = 99
Answer: 87
- 99 − 12 = 87
6. (answer space) − 48 = 49
Answer: 97
- 49 + 48 = 97
7.27 + (answer space) = 83
Answer: 56
- 83 − 27 = 56
8.15 + (answer space) = 36
Answer: 21
- 36 − 15 = 21
9. (answer space) − 20 = 63
Answer: 83
- 63 + 20 = 83
10.91 − (answer space) = 42
Answer: 49
- 91 − 42 = 49
11.100 − (answer space) = 78
Answer: 22
- 100 − 78 = 22
12.21 + (answer space) = 37
Answer: 16
- 37 − 21 = 16
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.