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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 244 · 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 124 people in the front coaches and 818 people in the back coaches. How many people are on the train?
  2. 2.A school has 394 children. 110 of them are girls. How many boys are there?
  3. 3.? − 315 = 90
  4. 4.A school has 315 children. 117 of them are girls. How many boys are there?
  5. 5.? − 276 = 94
  6. 6.A school has 672 children. 659 of them are girls. How many boys are there?
  7. 7.694 − ? = 208
  8. 8.? + 492 = 656
  9. 9.A train has 118 people in the front coaches and 750 people in the back coaches. How many people are on the train?
  10. 10.575 − 574 =
  11. 11.987 − 389 =
  12. 12.? + 342 = 667
  13. 13.A train has 635 people in the front coaches and 131 people in the back coaches. How many people are on the train?
  14. 14.200 + 219 =
  15. 15.307 + ? = 731
  16. 16.995 − 340 =
  17. 17.A train has 500 people in the front coaches and 242 people in the back coaches. How many people are on the train?
  18. 18.746 + ? = 995
  19. 19.A school has 316 children. 315 of them are girls. How many boys are there?
  20. 20.310 − 226 =
  21. 21.713 + 266 =
  22. 22.? − 230 = 686
  23. 23.789 + ? = 942
  24. 24.239 + 123 =
  25. 25.627 − 621 =
  26. 26.A school has 871 children. 300 of them are girls. How many boys are there?
  27. 27.A school has 849 children. 641 of them are girls. How many boys are there?
  28. 28.291 + 361 =
  29. 29.189 + 186 =
  30. 30.307 − 269 =
  31. 31.A train has 576 people in the front coaches and 295 people in the back coaches. How many people are on the train?
  32. 32.A school has 635 children. 397 of them are girls. How many boys are there?
  33. 33.A school has 762 children. 188 of them are girls. How many boys are there?
  34. 34.861 + 105 =
  35. 35.? + 113 = 947
  36. 36.A school has 848 children. 204 of them are girls. How many boys are there?
  37. 37.397 + ? = 515
  38. 38.958 − 896 =
  39. 39.373 − ? = 190
  40. 40.265 − 120 =

Answer key

  1. 942
  2. 284
  3. 405
  4. 198
  5. 370
  6. 13
  7. 486
  8. 164
  9. 868
  10. 1
  11. 598
  12. 325
  13. 766
  14. 419
  15. 424
  16. 655
  17. 742
  18. 249
  19. 1
  20. 84
  21. 979
  22. 916
  23. 153
  24. 362
  25. 6
  26. 571
  27. 208
  28. 652
  29. 375
  30. 38
  31. 871
  32. 238
  33. 574
  34. 966
  35. 834
  36. 644
  37. 118
  38. 62
  39. 183
  40. 145

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