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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 120 · 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. 1.282 + ? = 975
  2. 2.435 − 339 =
  3. 3.A train has 254 people in the front coaches and 212 people in the back coaches. How many people are on the train?
  4. 4.747 + ? = 902
  5. 5.? − 803 = 147
  6. 6.A train has 885 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  7. 7.431 + ? = 880
  8. 8.A train has 238 people in the front coaches and 112 people in the back coaches. How many people are on the train?
  9. 9.789 − ? = 530
  10. 10.606 − 236 =
  11. 11.A school has 850 children. 586 of them are girls. How many boys are there?
  12. 12.300 + ? = 683
  13. 13.649 + 198 =
  14. 14.? − 131 = 76
  15. 15.231 + ? = 339
  16. 16.A school has 948 children. 372 of them are girls. How many boys are there?
  17. 17.755 − ? = 29
  18. 18.A train has 358 people in the front coaches and 442 people in the back coaches. How many people are on the train?
  19. 19.643 − 269 =
  20. 20.150 + 358 =
  21. 21.552 − ? = 406
  22. 22.681 − ? = 1
  23. 23.A school has 327 children. 128 of them are girls. How many boys are there?
  24. 24.A school has 802 children. 128 of them are girls. How many boys are there?
  25. 25.A school has 639 children. 609 of them are girls. How many boys are there?
  26. 26.152 + 672 =
  27. 27.838 − 733 =
  28. 28.? − 871 = 52
  29. 29.489 − 369 =
  30. 30.A train has 232 people in the front coaches and 684 people in the back coaches. How many people are on the train?
  31. 31.293 − 206 =
  32. 32.775 + ? = 880
  33. 33.? + 656 = 809
  34. 34.200 + 312 =
  35. 35.571 + ? = 975
  36. 36.615 + 371 =
  37. 37.? − 219 = 611
  38. 38.A train has 718 people in the front coaches and 272 people in the back coaches. How many people are on the train?
  39. 39.A school has 996 children. 305 of them are girls. How many boys are there?
  40. 40.A school has 247 children. 163 of them are girls. How many boys are there?

Answer key

  1. 693
  2. 96
  3. 466
  4. 155
  5. 950
  6. 993
  7. 449
  8. 350
  9. 259
  10. 370
  11. 264
  12. 383
  13. 847
  14. 207
  15. 108
  16. 576
  17. 726
  18. 800
  19. 374
  20. 508
  21. 146
  22. 680
  23. 199
  24. 674
  25. 30
  26. 824
  27. 105
  28. 923
  29. 120
  30. 916
  31. 87
  32. 105
  33. 153
  34. 512
  35. 404
  36. 986
  37. 830
  38. 990
  39. 691
  40. 84

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