Addition practice worksheet with 16 three-digit math problems.

Let’s solve each addition problem step by step.

We’ll go row by row, column by column.

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Row 1:

1. 368 + 125
- 8 + 5 = 13 → write 3, carry 1
- 6 + 2 + 1 (carry) = 9
- 3 + 1 = 4
→ 493

2. 659 + 254
- 9 + 4 = 13 → write 3, carry 1
- 5 + 5 + 1 = 11 → write 1, carry 1
- 6 + 2 + 1 = 9
→ 913

3. 476 + 436
- 6 + 6 = 12 → write 2, carry 1
- 7 + 3 + 1 = 11 → write 1, carry 1
- 4 + 4 + 1 = 9
→ 912

4. 524 + 177
- 4 + 7 = 11 → write 1, carry 1
- 2 + 7 + 1 = 10 → write 0, carry 1
- 5 + 1 + 1 = 7
→ 701

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Row 2:

5. 746 + 705
- 6 + 5 = 11 → write 1, carry 1
- 4 + 0 + 1 = 5
- 7 + 7 = 14 → write 4, carry 1 → but wait, no more digits? Actually, it’s 14 in hundreds place → so 1400s? No — let’s do properly:

Actually:
- Units: 6+5=11 → 1, carry 1
- Tens: 4+0+1=5
- Hundreds: 7+7=14 → write 14
→ So total is 1451

Wait — that can’t be right because 746 + 705 should be around 1450? Let me check:

746 + 700 = 1446, plus 5 = 1451 → yes.

But looking at the worksheet layout — all problems are 3-digit + 3-digit, and answers may be 3 or 4 digits. That’s fine.

So → 1451

6. 863 + 329
- 3 + 9 = 12 → write 2, carry 1
- 6 + 2 + 1 = 9
- 8 + 3 = 11 → write 11
→ 1192

7. 625 + 475
- 5 + 5 = 10 → write 0, carry 1
- 2 + 7 + 1 = 10 → write 0, carry 1
- 6 + 4 + 1 = 11 → write 11
→ 1100

8. 274 + 135
- 4 + 5 = 9
- 7 + 3 = 10 → write 0, carry 1
- 2 + 1 + 1 = 4
→ 409

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Row 3:

9. 278 + 258
- 8 + 8 = 16 → write 6, carry 1
- 7 + 5 + 1 = 13 → write 3, carry 1
- 2 + 2 + 1 = 5
→ 536

10. 389 + 134
- 9 + 4 = 13 → write 3, carry 1
- 8 + 3 + 1 = 12 → write 2, carry 1
- 3 + 1 + 1 = 5
→ 523

11. 943 + 182
- 3 + 2 = 5
- 4 + 8 = 12 → write 2, carry 1
- 9 + 1 + 1 = 11 → write 11
→ 1125

12. 517 + 463
- 7 + 3 = 10 → write 0, carry 1
- 1 + 6 + 1 = 8
- 5 + 4 = 9
→ 980

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Row 4:

13. 592 + 668
- 2 + 8 = 10 → write 0, carry 1
- 9 + 6 + 1 = 16 → write 6, carry 1
- 5 + 6 + 1 = 12 → write 12
→ 1260

14. 453 + 885
- 3 + 5 = 8
- 5 + 8 = 13 → write 3, carry 1
- 4 + 8 + 1 = 13 → write 13
→ 1338

15. 275 + 325
- 5 + 5 = 10 → write 0, carry 1
- 7 + 2 + 1 = 10 → write 0, carry 1
- 2 + 3 + 1 = 6
→ 600

16. 784 + 391
- 4 + 1 = 5
- 8 + 9 = 17 → write 7, carry 1
- 7 + 3 + 1 = 11 → write 11
→ 1175

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Now, let’s list all answers clearly in order as they appear on the sheet:

Row 1:
368 + 125 = 493
659 + 254 = 913
476 + 436 = 912
524 + 177 = 701

Row 2:
746 + 705 = 1451
863 + 329 = 1192
625 + 475 = 1100
274 + 135 = 409

Row 3:
278 + 258 = 536
389 + 134 = 523
943 + 182 = 1125
517 + 463 = 980

Row 4:
592 + 668 = 1260
453 + 885 = 1338
275 + 325 = 600
784 + 391 = 1175

All calculations double-checked.

Final Answer:
493, 913, 912, 701, 1451, 1192, 1100, 409, 536, 523, 1125, 980, 1260, 1338, 600, 1175