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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 227 · 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.? − 294 = 265
  2. 2.328 + 316 =
  3. 3.A school has 868 children. 815 of them are girls. How many boys are there?
  4. 4.192 + 539 =
  5. 5.A school has 325 children. 322 of them are girls. How many boys are there?
  6. 6.A train has 231 people in the front coaches and 286 people in the back coaches. How many people are on the train?
  7. 7.A train has 187 people in the front coaches and 560 people in the back coaches. How many people are on the train?
  8. 8.798 − 143 =
  9. 9.770 + 137 =
  10. 10.606 + 287 =
  11. 11.691 − 588 =
  12. 12.410 − ? = 196
  13. 13.? − 171 = 203
  14. 14.A train has 192 people in the front coaches and 113 people in the back coaches. How many people are on the train?
  15. 15.A train has 265 people in the front coaches and 284 people in the back coaches. How many people are on the train?
  16. 16.? + 331 = 588
  17. 17.A train has 425 people in the front coaches and 454 people in the back coaches. How many people are on the train?
  18. 18.336 + 575 =
  19. 19.? + 237 = 403
  20. 20.? + 189 = 747
  21. 21.? + 503 = 801
  22. 22.729 − 430 =
  23. 23.732 + 187 =
  24. 24.? − 629 = 23
  25. 25.738 + ? = 954
  26. 26.435 + 396 =
  27. 27.A train has 898 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  28. 28.718 − 379 =
  29. 29.885 − 104 =
  30. 30.877 + ? = 980
  31. 31.192 + 330 =
  32. 32.? + 150 = 518
  33. 33.934 − ? = 519
  34. 34.278 + 237 =
  35. 35.881 − ? = 230
  36. 36.644 − ? = 488
  37. 37.868 − ? = 158
  38. 38.A school has 979 children. 336 of them are girls. How many boys are there?
  39. 39.A school has 860 children. 211 of them are girls. How many boys are there?
  40. 40.919 − 592 =

Answer key

  1. 559
  2. 644
  3. 53
  4. 731
  5. 3
  6. 517
  7. 747
  8. 655
  9. 907
  10. 893
  11. 103
  12. 214
  13. 374
  14. 305
  15. 549
  16. 257
  17. 879
  18. 911
  19. 166
  20. 558
  21. 298
  22. 299
  23. 919
  24. 652
  25. 216
  26. 831
  27. 998
  28. 339
  29. 781
  30. 103
  31. 522
  32. 368
  33. 415
  34. 515
  35. 651
  36. 156
  37. 710
  38. 643
  39. 649
  40. 327

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