Year 3 Addition Worksheet — Level 1 — Practice Set 4 — Answers
Answer sheet with worked solutions for the Year 3 addition worksheet.
Success TutoringWorksheetsAnswer sheetYear 3 · Mathematics · AdditionYear 3 Addition Worksheet — Level 1 — Practice Set 4 — Answers
Set out each sum in columns. Show any regrouping.
1.
351
+407
Answer: 758
- 1 + 7 = 8
- 5 + 0 = 5
- 3 + 4 = 7
2.
768
+231
Answer: 999
- 8 + 1 = 9
- 6 + 3 = 9
- 7 + 2 = 9
3.
571
+106
Answer: 677
- 1 + 6 = 7
- 7 + 0 = 7
- 5 + 1 = 6
4.
853
+146
Answer: 999
- 3 + 6 = 9
- 5 + 4 = 9
- 8 + 1 = 9
5.
533
+466
Answer: 999
- 3 + 6 = 9
- 3 + 6 = 9
- 5 + 4 = 9
6.
574
+425
Answer: 999
- 4 + 5 = 9
- 7 + 2 = 9
- 5 + 4 = 9
7.
749
+149
Answer: 898
- 9 + 9 = 18 → write 8, carry 1
- 4 + 4 + 1 = 9
- 7 + 1 = 8
8.
271
+139
Answer: 410
- 1 + 9 = 10 → write 0, carry 1
- 7 + 3 + 1 = 11 → write 1, carry 1
- 2 + 1 + 1 = 4
9.
369
+549
Answer: 918
- 9 + 9 = 18 → write 8, carry 1
- 6 + 4 + 1 = 11 → write 1, carry 1
- 3 + 5 + 1 = 9
10.
113
+886
Answer: 999
- 3 + 6 = 9
- 1 + 8 = 9
- 1 + 8 = 9
11.
426
+573
Answer: 999
- 6 + 3 = 9
- 2 + 7 = 9
- 4 + 5 = 9
12.
119
+232
Answer: 351
- 9 + 2 = 11 → write 1, carry 1
- 1 + 3 + 1 = 5
- 1 + 2 = 3
13.
431
+568
Answer: 999
- 1 + 8 = 9
- 3 + 6 = 9
- 4 + 5 = 9
14.
258
+660
Answer: 918
- 8 + 0 = 8
- 5 + 6 = 11 → write 1, carry 1
- 2 + 6 + 1 = 9
15.
557
+442
Answer: 999
- 7 + 2 = 9
- 5 + 4 = 9
- 5 + 4 = 9
16.
348
+301
Answer: 649
- 8 + 1 = 9
- 4 + 0 = 4
- 3 + 3 = 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.
- Celebrate what went well first, then pick one thing to work on next.