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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 906 · 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.A train has 477 people in the front coaches and 399 people in the back coaches. How many people are on the train?
  2. 2.135 + 495 =
  3. 3.376 + 215 =
  4. 4.832 + ? = 938
  5. 5.767 − 520 =
  6. 6.491 + 221 =
  7. 7.251 + 140 =
  8. 8.700 + 101 =
  9. 9.750 + ? = 929
  10. 10.435 − 256 =
  11. 11.516 − 366 =
  12. 12.A school has 425 children. 142 of them are girls. How many boys are there?
  13. 13.398 + 460 =
  14. 14.232 + 352 =
  15. 15.A train has 375 people in the front coaches and 122 people in the back coaches. How many people are on the train?
  16. 16.231 − ? = 125
  17. 17.A train has 536 people in the front coaches and 209 people in the back coaches. How many people are on the train?
  18. 18.277 + 107 =
  19. 19.323 + 487 =
  20. 20.A train has 298 people in the front coaches and 177 people in the back coaches. How many people are on the train?
  21. 21.? − 161 = 649
  22. 22.752 − 608 =
  23. 23.451 + 269 =
  24. 24.A school has 274 children. 258 of them are girls. How many boys are there?
  25. 25.592 − 307 =
  26. 26.? − 555 = 232
  27. 27.A school has 796 children. 594 of them are girls. How many boys are there?
  28. 28.A school has 306 children. 133 of them are girls. How many boys are there?
  29. 29.110 + ? = 412
  30. 30.784 − ? = 233
  31. 31.? − 185 = 323
  32. 32.852 + 143 =
  33. 33.598 + 388 =
  34. 34.A school has 466 children. 110 of them are girls. How many boys are there?
  35. 35.373 − ? = 79
  36. 36.721 + 127 =
  37. 37.A school has 260 children. 185 of them are girls. How many boys are there?
  38. 38.? + 473 = 581
  39. 39.227 + ? = 493
  40. 40.706 − 636 =

Answer key

  1. 876
  2. 630
  3. 591
  4. 106
  5. 247
  6. 712
  7. 391
  8. 801
  9. 179
  10. 179
  11. 150
  12. 283
  13. 858
  14. 584
  15. 497
  16. 106
  17. 745
  18. 384
  19. 810
  20. 475
  21. 810
  22. 144
  23. 720
  24. 16
  25. 285
  26. 787
  27. 202
  28. 173
  29. 302
  30. 551
  31. 508
  32. 995
  33. 986
  34. 356
  35. 294
  36. 848
  37. 75
  38. 108
  39. 266
  40. 70

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