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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 447 · 40 sums
TalentJR

The method (Column by column): Line up ones, tens and hundreds. Add from the right; 10 or more → carry 1 to the next column. Subtract from the right; top digit smaller → borrow 1 from the next column. Missing number in an addition = total − the number you know.

NameDateTime takenScore ___ / 40
  1. 1.759 + ? = 887
  2. 2.659 − 508 =
  3. 3.381 + 335 =
  4. 4.A school has 928 children. 183 of them are girls. How many boys are there?
  5. 5.A train has 637 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  6. 6.466 + ? = 583
  7. 7.A school has 750 children. 408 of them are girls. How many boys are there?
  8. 8.A train has 132 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  9. 9.899 − 842 =
  10. 10.660 − ? = 488
  11. 11.? + 128 = 986
  12. 12.827 + 120 =
  13. 13.A train has 149 people in the front coaches and 266 people in the back coaches. How many people are on the train?
  14. 14.? + 180 = 647
  15. 15.A train has 336 people in the front coaches and 447 people in the back coaches. How many people are on the train?
  16. 16.327 − 103 =
  17. 17.A train has 350 people in the front coaches and 353 people in the back coaches. How many people are on the train?
  18. 18.567 − 315 =
  19. 19.221 − 184 =
  20. 20.? − 317 = 505
  21. 21.427 − 284 =
  22. 22.A school has 609 children. 565 of them are girls. How many boys are there?
  23. 23.681 − 630 =
  24. 24.? + 374 = 596
  25. 25.482 − 432 =
  26. 26.702 − 650 =
  27. 27.A school has 730 children. 326 of them are girls. How many boys are there?
  28. 28.262 + ? = 530
  29. 29.770 + 214 =
  30. 30.A train has 348 people in the front coaches and 371 people in the back coaches. How many people are on the train?
  31. 31.? − 190 = 82
  32. 32.897 − 283 =
  33. 33.888 + ? = 993
  34. 34.960 − ? = 632
  35. 35.207 − 153 =
  36. 36.800 − 392 =
  37. 37.283 + 169 =
  38. 38.581 − 576 =
  39. 39.A school has 608 children. 189 of them are girls. How many boys are there?
  40. 40.A train has 643 people in the front coaches and 218 people in the back coaches. How many people are on the train?

Answer key

  1. 128
  2. 151
  3. 716
  4. 745
  5. 754
  6. 117
  7. 342
  8. 257
  9. 57
  10. 172
  11. 858
  12. 947
  13. 415
  14. 467
  15. 783
  16. 224
  17. 703
  18. 252
  19. 37
  20. 822
  21. 143
  22. 44
  23. 51
  24. 222
  25. 50
  26. 52
  27. 404
  28. 268
  29. 984
  30. 719
  31. 272
  32. 614
  33. 105
  34. 328
  35. 54
  36. 408
  37. 452
  38. 5
  39. 419
  40. 861

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