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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 487 · 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. 1.627 + 272 =
  2. 2.506 − 436 =
  3. 3.597 − ? = 188
  4. 4.300 − 157 =
  5. 5.625 + 222 =
  6. 6.A school has 386 children. 197 of them are girls. How many boys are there?
  7. 7.? − 609 = 99
  8. 8.A school has 290 children. 123 of them are girls. How many boys are there?
  9. 9.A school has 902 children. 177 of them are girls. How many boys are there?
  10. 10.? − 246 = 41
  11. 11.A school has 540 children. 190 of them are girls. How many boys are there?
  12. 12.374 + 542 =
  13. 13.847 − 695 =
  14. 14.752 + 157 =
  15. 15.244 − 239 =
  16. 16.288 + ? = 391
  17. 17.610 + ? = 901
  18. 18.A school has 522 children. 517 of them are girls. How many boys are there?
  19. 19.A train has 721 people in the front coaches and 170 people in the back coaches. How many people are on the train?
  20. 20.383 + 326 =
  21. 21.A school has 558 children. 541 of them are girls. How many boys are there?
  22. 22.A train has 857 people in the front coaches and 123 people in the back coaches. How many people are on the train?
  23. 23.? + 160 = 565
  24. 24.328 − 171 =
  25. 25.493 − 109 =
  26. 26.605 + 270 =
  27. 27.? + 654 = 926
  28. 28.? + 574 = 729
  29. 29.A train has 838 people in the front coaches and 139 people in the back coaches. How many people are on the train?
  30. 30.999 − 428 =
  31. 31.478 + 362 =
  32. 32.A school has 508 children. 415 of them are girls. How many boys are there?
  33. 33.816 + 158 =
  34. 34.804 − 536 =
  35. 35.410 − ? = 68
  36. 36.845 − 104 =
  37. 37.134 + 701 =
  38. 38.? − 192 = 75
  39. 39.224 − ? = 99
  40. 40.? − 108 = 299

Answer key

  1. 899
  2. 70
  3. 409
  4. 143
  5. 847
  6. 189
  7. 708
  8. 167
  9. 725
  10. 287
  11. 350
  12. 916
  13. 152
  14. 909
  15. 5
  16. 103
  17. 291
  18. 5
  19. 891
  20. 709
  21. 17
  22. 980
  23. 405
  24. 157
  25. 384
  26. 875
  27. 272
  28. 155
  29. 977
  30. 571
  31. 840
  32. 93
  33. 974
  34. 268
  35. 342
  36. 741
  37. 835
  38. 267
  39. 125
  40. 407

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