Comprehensive worksheet featuring mixed three-digit addition and subtraction problems for math practice.

Let's solve each of the three-digit addition and subtraction problems step by step. I'll go through them row by row and provide the correct answers along with a brief explanation for each.

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Row 1

1. $ 804 - 188 = 616 $
(804 - 188: 4-8 can't do, borrow → 14-8=6, 9-8=1, 7-1=6 → 616)

2. $ 851 - 195 = 656 $
(851 - 195: 1-5 → borrow → 11-5=6, 4-9 → borrow → 14-9=5, 7-1=6 → 656)

3. $ 939 + 336 = 1275 $
(939 + 336: 9+6=15 → carry 1, 3+3+1=7, 9+3=12 → 1275)

4. $ 740 + 797 = 1537 $
(740 + 797: 0+7=7, 4+9=13 → carry 1, 7+7+1=15 → 1537)

5. $ 242 + 119 = 361 $
(242 + 119: 2+9=11 → carry 1, 4+1+1=6, 2+1=3 → 361)

6. $ 973 + 186 = 1159 $
(973 + 186: 3+6=9, 7+8=15 → carry 1, 9+1+1=11 → 1159)

7. $ 165 - 104 = 61 $
(165 - 104: 5-4=1, 6-0=6, 1-1=0 → 61)

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Row 2

8. $ 419 - 385 = 34 $
(419 - 385: 9-5=4, 1-8 → borrow → 11-8=3, 3-3=0 → 34)

9. $ 910 + 639 = 1549 $
(910 + 639: 0+9=9, 1+3=4, 9+6=15 → 1549)

10. $ 182 + 509 = 691 $
(182 + 509: 2+9=11 → carry 1, 8+0+1=9, 1+5=6 → 691)

11. $ 629 - 220 = 409 $
(629 - 220: 9-0=9, 2-2=0, 6-2=4 → 409)

12. $ 747 + 434 = 1181 $
(747 + 434: 7+4=11 → carry 1, 4+3+1=8, 7+4=11 → 1181)

13. $ 507 - 504 = 3 $
(507 - 504: 7-4=3, 0-0=0, 5-5=0 → 3)

14. $ 468 - 164 = 304 $
(468 - 164: 8-4=4, 6-6=0, 4-1=3 → 304)

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Row 3

15. $ 380 + 369 = 749 $
(380 + 369: 0+9=9, 8+6=14 → carry 1, 3+3+1=7 → 749)

16. $ 676 + 380 = 1056 $
(676 + 380: 6+0=6, 7+8=15 → carry 1, 6+3+1=10 → 1056)

17. $ 470 - 366 = 104 $
(470 - 366: 0-6 → borrow → 10-6=4, 6-6=0, 3-3=0 → 104)

18. $ 439 + 747 = 1186 $
(439 + 747: 9+7=16 → carry 1, 3+4+1=8, 4+7=11 → 1186)

19. $ 551 - 368 = 183 $
(551 - 368: 1-8 → borrow → 11-8=3, 4-6 → borrow → 14-6=8, 4-3=1 → 183)

20. $ 100 + 502 = 602 $
(100 + 502: 0+2=2, 0+0=0, 1+5=6 → 602)

21. $ 619 - 579 = 40 $
(619 - 579: 9-9=0, 1-7 → borrow → 11-7=4, 5-5=0 → 40)

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Row 4

22. $ 774 + 234 = 1008 $
(774 + 234: 4+4=8, 7+3=10 → carry 1, 7+2+1=10 → 1008)

23. $ 998 - 805 = 193 $
(998 - 805: 8-5=3, 9-0=9, 9-8=1 → 193)

24. $ 720 + 726 = 1446 $
(720 + 726: 0+6=6, 2+2=4, 7+7=14 → 1446)

25. $ 911 + 288 = 1199 $
(911 + 288: 1+8=9, 1+8=9, 9+2=11 → 1199)

26. $ 201 - 127 = 74 $
(201 - 127: 1-7 → borrow → 11-7=4, 9-2=7, 1-1=0 → 74)

27. $ 379 + 802 = 1181 $
(379 + 802: 9+2=11 → carry 1, 7+0+1=8, 3+8=11 → 1181)

28. $ 640 + 353 = 993 $
(640 + 353: 0+3=3, 4+5=9, 6+3=9 → 993)

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Row 5

29. $ 552 + 172 = 724 $
(552 + 172: 2+2=4, 5+7=12 → carry 1, 5+1+1=7 → 724)

30. $ 519 + 258 = 777 $
(519 + 258: 9+8=17 → carry 1, 1+5+1=7, 5+2=7 → 777)

31. $ 922 - 839 = 83 $
(922 - 839: 2-9 → borrow → 12-9=3, 1-3 → borrow → 11-3=8, 8-8=0 → 83)

32. $ 473 + 647 = 1120 $
(473 + 647: 3+7=10 → carry 1, 7+4+1=12 → carry 1, 4+6+1=11 → 1120)

33. $ 380 - 280 = 100 $
(380 - 280: 0-0=0, 8-8=0, 3-2=1 → 100)

34. $ 221 - 127 = 94 $
(221 - 127: 1-7 → borrow → 11-7=4, 1-2 → borrow → 11-2=9, 1-1=0 → 94)

35. $ 535 + 491 = 1026 $
(535 + 491: 5+1=6, 3+9=12 → carry 1, 5+4+1=10 → 1026)

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Row 6

36. $ 541 + 306 = 847 $
(541 + 306: 1+6=7, 4+0=4, 5+3=8 → 847)

37. $ 776 - 292 = 484 $
(776 - 292: 6-2=4, 7-9 → borrow → 17-9=8, 6-2=4 → 484)

38. $ 154 + 468 = 622 $
(154 + 468: 4+8=12 → carry 1, 5+6+1=12 → carry 1, 1+4+1=6 → 622)

39. $ 295 - 106 = 189 $
(295 - 106: 5-6 → borrow → 15-6=9, 8-0=8, 1-1=0 → 189)

40. $ 931 - 230 = 701 $
(931 - 230: 1-0=1, 3-3=0, 9-2=7 → 701)

41. $ 549 + 563 = 1112 $
(549 + 563: 9+3=12 → carry 1, 4+6+1=11 → carry 1, 5+5+1=11 → 1112)

42. $ 544 + 382 = 926 $
(544 + 382: 4+2=6, 4+8=12 → carry 1, 5+3+1=9 → 926)

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Row 7

43. $ 401 + 553 = 954 $
(401 + 553: 1+3=4, 0+5=5, 4+5=9 → 954)

44. $ 161 + 627 = 788 $
(161 + 627: 1+7=8, 6+2=8, 1+6=7 → 788)

45. $ 229 - 199 = 30 $
(229 - 199: 9-9=0, 2-9 → borrow → 12-9=3, 1-1=0 → 30)

46. $ 644 + 728 = 1372 $
(644 + 728: 4+8=12 → carry 1, 4+2+1=7, 6+7=13 → 1372)

47. $ 221 - 123 = 98 $
(221 - 123: 1-3 → borrow → 11-3=8, 1-2 → borrow → 11-2=9, 1-1=0 → 98)

48. $ 446 + 550 = 996 $
(446 + 550: 6+0=6, 4+5=9, 4+5=9 → 996)

49. $ 871 - 147 = 724 $
(871 - 147: 1-7 → borrow → 11-7=4, 6-4=2, 8-1=7 → 724)

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✔ Final Answers (in order):

```
616 656 1275 1537 361 1159 61
34 1549 691 409 1181 3 304
749 1056 104 1186 183 602 40
1008 193 1446 1199 74 1181 993
724 777 83 1120 100 94 1026
847 484 622 189 701 1112 926
954 788 30 1372 98 996 724
```

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📝 Summary:

- All calculations involve three-digit numbers.
- For addition, carry over is used when the sum in any column exceeds 9.
- For subtraction, borrowing is used when the top digit is smaller than the bottom digit.
- The key is to work column by column from right to left.

Let me know if you'd like this formatted as a printable answer sheet!