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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 112 · 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 school has 872 children. 756 of them are girls. How many boys are there?
  2. 2.298 + ? = 674
  3. 3.694 − ? = 421
  4. 4.543 − ? = 288
  5. 5.673 + 231 =
  6. 6.A train has 755 people in the front coaches and 227 people in the back coaches. How many people are on the train?
  7. 7.352 − 112 =
  8. 8.454 + 287 =
  9. 9.751 + 184 =
  10. 10.152 + 825 =
  11. 11.A train has 859 people in the front coaches and 130 people in the back coaches. How many people are on the train?
  12. 12.537 − 236 =
  13. 13.A train has 357 people in the front coaches and 417 people in the back coaches. How many people are on the train?
  14. 14.724 + ? = 859
  15. 15.125 + 249 =
  16. 16.171 + 261 =
  17. 17.711 + 114 =
  18. 18.? − 283 = 266
  19. 19.A school has 650 children. 244 of them are girls. How many boys are there?
  20. 20.408 − 329 =
  21. 21.? + 801 = 943
  22. 22.A train has 760 people in the front coaches and 140 people in the back coaches. How many people are on the train?
  23. 23.A train has 346 people in the front coaches and 498 people in the back coaches. How many people are on the train?
  24. 24.? + 525 = 927
  25. 25.A train has 442 people in the front coaches and 449 people in the back coaches. How many people are on the train?
  26. 26.468 + ? = 645
  27. 27.851 + 124 =
  28. 28.750 − 216 =
  29. 29.451 − ? = 70
  30. 30.A school has 738 children. 639 of them are girls. How many boys are there?
  31. 31.688 + ? = 931
  32. 32.520 − ? = 57
  33. 33.? + 346 = 488
  34. 34.A school has 362 children. 244 of them are girls. How many boys are there?
  35. 35.? − 387 = 131
  36. 36.993 − 250 =
  37. 37.680 − 418 =
  38. 38.900 − ? = 9
  39. 39.525 − 505 =
  40. 40.905 − 314 =

Answer key

  1. 116
  2. 376
  3. 273
  4. 255
  5. 904
  6. 982
  7. 240
  8. 741
  9. 935
  10. 977
  11. 989
  12. 301
  13. 774
  14. 135
  15. 374
  16. 432
  17. 825
  18. 549
  19. 406
  20. 79
  21. 142
  22. 900
  23. 844
  24. 402
  25. 891
  26. 177
  27. 975
  28. 534
  29. 381
  30. 99
  31. 243
  32. 463
  33. 142
  34. 118
  35. 518
  36. 743
  37. 262
  38. 891
  39. 20
  40. 591

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