Printable math worksheet featuring 20 three-digit addition and subtraction exercises.

Let's solve each of the addition and subtraction problems step by step. We'll go through them row by row.

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Row 1:

1. 475 - 379
- 5 - 9 → can't do, borrow: 15 - 9 = 6
- 6 (after borrowing) - 7 → can't do, borrow: 16 - 7 = 9
- 3 (after borrowing) - 3 = 0
→ 96

2. 972 - 932
- 2 - 2 = 0
- 7 - 3 = 4
- 9 - 9 = 0
→ 40

3. 282 + 625
- 2 + 5 = 7
- 8 + 2 = 10 → write 0, carry 1
- 2 + 6 + 1 = 9
→ 907

4. 144 + 925
- 4 + 5 = 9
- 4 + 2 = 6
- 1 + 9 = 10
→ 1069

5. 670 - 579
- 0 - 9 → borrow: 10 - 9 = 1
- 6 (after borrowing) - 7 → borrow: 16 - 7 = 9
- 5 (after borrowing) - 5 = 0
→ 91

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Row 2:

6. 832 - 620
- 2 - 0 = 2
- 3 - 2 = 1
- 8 - 6 = 2
→ 212

7. 846 + 453
- 6 + 3 = 9
- 4 + 5 = 9
- 8 + 4 = 12
→ 1299

8. 203 + 550
- 3 + 0 = 3
- 0 + 5 = 5
- 2 + 5 = 7
→ 753

9. 276 + 608
- 6 + 8 = 14 → write 4, carry 1
- 7 + 0 + 1 = 8
- 2 + 6 = 8
→ 884

10. 899 - 821
- 9 - 1 = 8
- 9 - 2 = 7
- 8 - 8 = 0
→ 78

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Row 3:

11. 512 + 162
- 2 + 2 = 4
- 1 + 6 = 7
- 5 + 1 = 6
→ 674

12. 673 - 314
- 3 - 4 → borrow: 13 - 4 = 9
- 6 (after borrow) - 1 = 5
- 6 - 3 = 3
→ 359

13. 243 + 389
- 3 + 9 = 12 → write 2, carry 1
- 4 + 8 + 1 = 13 → write 3, carry 1
- 2 + 3 + 1 = 6
→ 632

14. 384 + 353
- 4 + 3 = 7
- 8 + 5 = 13 → write 3, carry 1
- 3 + 3 + 1 = 7
→ 737

15. 877 - 686
- 7 - 6 = 1
- 7 - 8 → borrow: 17 - 8 = 9
- 7 (after borrow) - 6 = 1
→ 191

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Row 4:

16. 221 - 150
- 1 - 0 = 1
- 2 - 5 → borrow: 12 - 5 = 7
- 1 (after borrow) - 1 = 0
→ 71

17. 852 + 553
- 2 + 3 = 5
- 5 + 5 = 10 → write 0, carry 1
- 8 + 5 + 1 = 14
→ 1405

18. 755 + 319
- 5 + 9 = 14 → write 4, carry 1
- 5 + 1 + 1 = 7
- 7 + 3 = 10
→ 1074

19. 544 - 132
- 4 - 2 = 2
- 4 - 3 = 1
- 5 - 1 = 4
→ 412

20. 837 - 573
- 7 - 3 = 4
- 3 - 7 → borrow: 13 - 7 = 6
- 7 (after borrow) - 5 = 2
→ 264

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✔ Final Answers:

```
475 - 379 = 96
972 - 932 = 40
282 + 625 = 907
144 + 925 = 1069
670 - 579 = 91

832 - 620 = 212
846 + 453 = 1299
203 + 550 = 753
276 + 608 = 884
899 - 821 = 78

512 + 162 = 674
673 - 314 = 359
243 + 389 = 632
384 + 353 = 737
877 - 686 = 191

221 - 150 = 71
852 + 553 = 1405
755 + 319 = 1074
544 - 132 = 412
837 - 573 = 264
```

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✔ All problems solved correctly! Let me know if you'd like this formatted as a printable answer sheet.