Free 3 Digit Addition with Regrouping - Free Worksheets ... - Free Printable

Let’s solve each addition problem step by step. We’ll add the numbers column by column, starting from the right (ones place), and carry over if the sum is 10 or more.

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First Row:

1. 126 + 246
- Ones: 6 + 6 = 12 → write 2, carry 1
- Tens: 2 + 4 = 6, plus 1 carried = 7
- Hundreds: 1 + 2 = 3
→ 372

2. 295 + 127
- Ones: 5 + 7 = 12 → write 2, carry 1
- Tens: 9 + 2 = 11, plus 1 carried = 12 → write 2, carry 1
- Hundreds: 2 + 1 = 3, plus 1 carried = 4
→ 422

3. 449 + 363
- Ones: 9 + 3 = 12 → write 2, carry 1
- Tens: 4 + 6 = 10, plus 1 carried = 11 → write 1, carry 1
- Hundreds: 4 + 3 = 7, plus 1 carried = 8
→ 812

4. 128 + 194
- Ones: 8 + 4 = 12 → write 2, carry 1
- Tens: 2 + 9 = 11, plus 1 carried = 12 → write 2, carry 1
- Hundreds: 1 + 1 = 2, plus 1 carried = 3
→ 322

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Second Row:

5. 434 + 298
- Ones: 4 + 8 = 12 → write 2, carry 1
- Tens: 3 + 9 = 12, plus 1 carried = 13 → write 3, carry 1
- Hundreds: 4 + 2 = 6, plus 1 carried = 7
→ 732

6. 212 + 419
- Ones: 2 + 9 = 11 → write 1, carry 1
- Tens: 1 + 1 = 2, plus 1 carried = 3
- Hundreds: 2 + 4 = 6
→ 631

7. 627 + 227
- Ones: 7 + 7 = 14 → write 4, carry 1
- Tens: 2 + 2 = 4, plus 1 carried = 5
- Hundreds: 6 + 2 = 8
→ 854

8. 454 + 757
- Ones: 4 + 7 = 11 → write 1, carry 1
- Tens: 5 + 5 = 10, plus 1 carried = 11 → write 1, carry 1
- Hundreds: 4 + 7 = 11, plus 1 carried = 12 → write 2, carry 1 to thousands
→ 1211

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Third Row:

9. 257 + 647
- Ones: 7 + 7 = 14 → write 4, carry 1
- Tens: 5 + 4 = 9, plus 1 carried = 10 → write 0, carry 1
- Hundreds: 2 + 6 = 8, plus 1 carried = 9
→ 904

10. 309 + 495
- Ones: 9 + 5 = 14 → write 4, carry 1
- Tens: 0 + 9 = 9, plus 1 carried = 10 → write 0, carry 1
- Hundreds: 3 + 4 = 7, plus 1 carried = 8
→ 804

11. 583 + 448
- Ones: 3 + 8 = 11 → write 1, carry 1
- Tens: 8 + 4 = 12, plus 1 carried = 13 → write 3, carry 1
- Hundreds: 5 + 4 = 9, plus 1 carried = 10 → write 0, carry 1 to thousands
→ 1031

12. 556 + 554
- Ones: 6 + 4 = 10 → write 0, carry 1
- Tens: 5 + 5 = 10, plus 1 carried = 11 → write 1, carry 1
- Hundreds: 5 + 5 = 10, plus 1 carried = 11 → write 1, carry 1 to thousands
→ 1110

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Fourth Row:

13. 284 + 137
- Ones: 4 + 7 = 11 → write 1, carry 1
- Tens: 8 + 3 = 11, plus 1 carried = 12 → write 2, carry 1
- Hundreds: 2 + 1 = 3, plus 1 carried = 4
→ 421

14. 568 + 132
- Ones: 8 + 2 = 10 → write 0, carry 1
- Tens: 6 + 3 = 9, plus 1 carried = 10 → write 0, carry 1
- Hundreds: 5 + 1 = 6, plus 1 carried = 7
→ 700

15. 352 + 469
- Ones: 2 + 9 = 11 → write 1, carry 1
- Tens: 5 + 6 = 11, plus 1 carried = 12 → write 2, carry 1
- Hundreds: 3 + 4 = 7, plus 1 carried = 8
→ 821

16. 135 + 175
- Ones: 5 + 5 = 10 → write 0, carry 1
- Tens: 3 + 7 = 10, plus 1 carried = 11 → write 1, carry 1
- Hundreds: 1 + 1 = 2, plus 1 carried = 3
→ 310

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Final Answer:
372, 422, 812, 322, 732, 631, 854, 1211, 904, 804, 1031, 1110, 421, 700, 821, 310