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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 473 · 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 730 people in the front coaches and 214 people in the back coaches. How many people are on the train?
  2. 2.A train has 150 people in the front coaches and 243 people in the back coaches. How many people are on the train?
  3. 3.579 + 330 =
  4. 4.? + 820 = 974
  5. 5.? − 595 = 21
  6. 6.150 + 795 =
  7. 7.? + 363 = 797
  8. 8.A school has 832 children. 399 of them are girls. How many boys are there?
  9. 9.804 + 169 =
  10. 10.644 − 280 =
  11. 11.? + 360 = 793
  12. 12.A school has 898 children. 707 of them are girls. How many boys are there?
  13. 13.? − 242 = 269
  14. 14.A school has 674 children. 275 of them are girls. How many boys are there?
  15. 15.A school has 791 children. 318 of them are girls. How many boys are there?
  16. 16.892 − 688 =
  17. 17.649 + 350 =
  18. 18.A train has 155 people in the front coaches and 156 people in the back coaches. How many people are on the train?
  19. 19.? + 705 = 908
  20. 20.A school has 230 children. 183 of them are girls. How many boys are there?
  21. 21.298 + 665 =
  22. 22.281 + 246 =
  23. 23.A train has 597 people in the front coaches and 248 people in the back coaches. How many people are on the train?
  24. 24.761 + 123 =
  25. 25.799 + 121 =
  26. 26.448 − 197 =
  27. 27.A train has 382 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  28. 28.237 + 326 =
  29. 29.A train has 242 people in the front coaches and 202 people in the back coaches. How many people are on the train?
  30. 30.730 − 213 =
  31. 31.136 + 583 =
  32. 32.? + 232 = 844
  33. 33.A school has 971 children. 457 of them are girls. How many boys are there?
  34. 34.593 + 212 =
  35. 35.612 + 289 =
  36. 36.445 + 351 =
  37. 37.A train has 486 people in the front coaches and 435 people in the back coaches. How many people are on the train?
  38. 38.481 + 362 =
  39. 39.294 + 464 =
  40. 40.257 + 442 =

Answer key

  1. 944
  2. 393
  3. 909
  4. 154
  5. 616
  6. 945
  7. 434
  8. 433
  9. 973
  10. 364
  11. 433
  12. 191
  13. 511
  14. 399
  15. 473
  16. 204
  17. 999
  18. 311
  19. 203
  20. 47
  21. 963
  22. 527
  23. 845
  24. 884
  25. 920
  26. 251
  27. 486
  28. 563
  29. 444
  30. 517
  31. 719
  32. 612
  33. 514
  34. 805
  35. 901
  36. 796
  37. 921
  38. 843
  39. 758
  40. 699

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