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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 211 · 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. 1.559 − ? = 166
  2. 2.405 − ? = 284
  3. 3.A train has 611 people in the front coaches and 207 people in the back coaches. How many people are on the train?
  4. 4.661 + 314 =
  5. 5.A train has 146 people in the front coaches and 475 people in the back coaches. How many people are on the train?
  6. 6.? − 382 = 41
  7. 7.518 − 103 =
  8. 8.A school has 474 children. 353 of them are girls. How many boys are there?
  9. 9.A school has 668 children. 546 of them are girls. How many boys are there?
  10. 10.520 − 327 =
  11. 11.642 − 231 =
  12. 12.738 − ? = 417
  13. 13.504 − ? = 231
  14. 14.370 + ? = 923
  15. 15.A school has 731 children. 636 of them are girls. How many boys are there?
  16. 16.153 + 151 =
  17. 17.444 + 430 =
  18. 18.218 + ? = 443
  19. 19.A train has 469 people in the front coaches and 481 people in the back coaches. How many people are on the train?
  20. 20.A school has 875 children. 324 of them are girls. How many boys are there?
  21. 21.A train has 301 people in the front coaches and 344 people in the back coaches. How many people are on the train?
  22. 22.484 + 264 =
  23. 23.451 + 201 =
  24. 24.228 + ? = 886
  25. 25.A train has 684 people in the front coaches and 255 people in the back coaches. How many people are on the train?
  26. 26.388 − 312 =
  27. 27.567 − 318 =
  28. 28.634 + ? = 953
  29. 29.A train has 712 people in the front coaches and 205 people in the back coaches. How many people are on the train?
  30. 30.455 − ? = 219
  31. 31.269 + 633 =
  32. 32.157 + 824 =
  33. 33.? + 220 = 599
  34. 34.? + 690 = 996
  35. 35.847 + ? = 973
  36. 36.? + 700 = 802
  37. 37.A school has 220 children. 203 of them are girls. How many boys are there?
  38. 38.A school has 272 children. 151 of them are girls. How many boys are there?
  39. 39.669 + 330 =
  40. 40.A school has 218 children. 196 of them are girls. How many boys are there?

Answer key

  1. 393
  2. 121
  3. 818
  4. 975
  5. 621
  6. 423
  7. 415
  8. 121
  9. 122
  10. 193
  11. 411
  12. 321
  13. 273
  14. 553
  15. 95
  16. 304
  17. 874
  18. 225
  19. 950
  20. 551
  21. 645
  22. 748
  23. 652
  24. 658
  25. 939
  26. 76
  27. 249
  28. 319
  29. 917
  30. 236
  31. 902
  32. 981
  33. 379
  34. 306
  35. 126
  36. 102
  37. 17
  38. 121
  39. 999
  40. 22

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