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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 242 · 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.? − 321 = 115
  2. 2.806 + ? = 961
  3. 3.455 − 355 =
  4. 4.A train has 261 people in the front coaches and 466 people in the back coaches. How many people are on the train?
  5. 5.? + 710 = 829
  6. 6.A school has 211 children. 161 of them are girls. How many boys are there?
  7. 7.386 + 351 =
  8. 8.? + 655 = 946
  9. 9.662 − 316 =
  10. 10.397 + 272 =
  11. 11.298 − ? = 56
  12. 12.776 − ? = 274
  13. 13.236 + 138 =
  14. 14.A school has 451 children. 293 of them are girls. How many boys are there?
  15. 15.886 + 113 =
  16. 16.? + 368 = 805
  17. 17.? − 410 = 63
  18. 18.437 − ? = 204
  19. 19.A school has 315 children. 232 of them are girls. How many boys are there?
  20. 20.A school has 479 children. 435 of them are girls. How many boys are there?
  21. 21.292 + 597 =
  22. 22.A school has 574 children. 179 of them are girls. How many boys are there?
  23. 23.240 + 665 =
  24. 24.231 + 533 =
  25. 25.A train has 322 people in the front coaches and 378 people in the back coaches. How many people are on the train?
  26. 26.821 + ? = 998
  27. 27.293 − ? = 172
  28. 28.A train has 131 people in the front coaches and 490 people in the back coaches. How many people are on the train?
  29. 29.A school has 946 children. 516 of them are girls. How many boys are there?
  30. 30.418 + 286 =
  31. 31.818 − 430 =
  32. 32.A school has 642 children. 543 of them are girls. How many boys are there?
  33. 33.A school has 819 children. 166 of them are girls. How many boys are there?
  34. 34.780 + ? = 951
  35. 35.? + 718 = 955
  36. 36.222 − 205 =
  37. 37.? − 596 = 86
  38. 38.330 − 207 =
  39. 39.A school has 806 children. 435 of them are girls. How many boys are there?
  40. 40.576 − ? = 32

Answer key

  1. 436
  2. 155
  3. 100
  4. 727
  5. 119
  6. 50
  7. 737
  8. 291
  9. 346
  10. 669
  11. 242
  12. 502
  13. 374
  14. 158
  15. 999
  16. 437
  17. 473
  18. 233
  19. 83
  20. 44
  21. 889
  22. 395
  23. 905
  24. 764
  25. 700
  26. 177
  27. 121
  28. 621
  29. 430
  30. 704
  31. 388
  32. 99
  33. 653
  34. 171
  35. 237
  36. 17
  37. 682
  38. 123
  39. 371
  40. 544

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