Let's solve each of the addition problems step by step. I'll go through them one at a time and show the calculations.
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Row 1:
1.
478 + 347
- 8 + 7 = 15 → write down 5, carry over 1
- 7 + 4 + 1 = 12 → write down 2, carry over 1
- 4 + 3 + 1 = 8
✔ 825
2.
706 + 999
- 6 + 9 = 15 → write 5, carry 1
- 0 + 9 + 1 = 10 → write 0, carry 1
- 7 + 9 + 1 = 17
✔ 1705
3.
231 + 239
- 1 + 9 = 10 → write 0, carry 1
- 3 + 3 + 1 = 7
- 2 + 2 = 4
✔ 470
4.
568 + 103
- 8 + 3 = 11 → write 1, carry 1
- 6 + 0 + 1 = 7
- 5 + 1 = 6
✔ 671
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Row 2:
5.
349 + 109
- 9 + 9 = 18 → write 8, carry 1
- 4 + 0 + 1 = 5
- 3 + 1 = 4
✔ 458
6.
498 + 123
- 8 + 3 = 11 → write 1, carry 1
- 9 + 2 + 1 = 12 → write 2, carry 1
- 4 + 1 + 1 = 6
✔ 621
7.
780 + 129
- 0 + 9 = 9
- 8 + 2 = 10 → write 0, carry 1
- 7 + 1 + 1 = 9
✔ 909
8.
494 + 555
- 4 + 5 = 9
- 9 + 5 = 14 → write 4, carry 1
- 4 + 5 + 1 = 10
✔ 1049
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Row 3:
9.
375 + 197
- 5 + 7 = 12 → write 2, carry 1
- 7 + 9 + 1 = 17 → write 7, carry 1
- 3 + 1 + 1 = 5
✔ 572
10.
800 + 211
- 0 + 1 = 1
- 0 + 1 = 1
- 8 + 2 = 10
✔ 1011
11.
913 + 418
- 3 + 8 = 11 → write 1, carry 1
- 1 + 1 + 1 = 3
- 9 + 4 = 13
✔ 1331
12.
419 + 233
- 9 + 3 = 12 → write 2, carry 1
- 1 + 3 + 1 = 5
- 4 + 2 = 6
✔ 652
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Row 4:
13.
789 + 854
- 9 + 4 = 13 → write 3, carry 1
- 8 + 5 + 1 = 14 → write 4, carry 1
- 7 + 8 + 1 = 16
✔ 1643
14.
679 + 111
- 9 + 1 = 10 → write 0, carry 1
- 7 + 1 + 1 = 9
- 6 + 1 = 7
✔ 790
15.
348 + 267
- 8 + 7 = 15 → write 5, carry 1
- 4 + 6 + 1 = 11 → write 1, carry 1
- 3 + 2 + 1 = 6
✔ 615
16.
812 + 937
- 2 + 7 = 9
- 1 + 3 = 4
- 8 + 9 = 17
✔ 1749
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Bottom Row:
17.
872 + 931
- 2 + 1 = 3
- 7 + 3 = 10 → write 0, carry 1
- 8 + 9 + 1 = 18
✔ 1803
18.
499 + 225
- 9 + 5 = 14 → write 4, carry 1
- 9 + 2 + 1 = 12 → write 2, carry 1
- 4 + 2 + 1 = 7
✔ 724
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✔ Final Answers:
| Problem | Answer |
|--------|--------|
| 478 + 347 |
825 |
| 706 + 999 |
1705 |
| 231 + 239 |
470 |
| 568 + 103 |
671 |
| 349 + 109 |
458 |
| 498 + 123 |
621 |
| 780 + 129 |
909 |
| 494 + 555 |
1049 |
| 375 + 197 |
572 |
| 800 + 211 |
1011 |
| 913 + 418 |
1331 |
| 419 + 233 |
652 |
| 789 + 854 |
1643 |
| 679 + 111 |
790 |
| 348 + 267 |
615 |
| 812 + 937 |
1749 |
| 872 + 931 |
1803 |
| 499 + 225 |
724 |
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✔ All problems solved! Let me know if you'd like this formatted as a printable worksheet or need help checking any specific problem.
Parent Tip: Review the logic above to help your child master the concept of math for third graders worksheet.
