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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 615 · 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. 1.388 − 193 =
  2. 2.? + 499 = 867
  3. 3.A train has 669 people in the front coaches and 127 people in the back coaches. How many people are on the train?
  4. 4.A train has 280 people in the front coaches and 222 people in the back coaches. How many people are on the train?
  5. 5.A train has 289 people in the front coaches and 237 people in the back coaches. How many people are on the train?
  6. 6.A train has 783 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  7. 7.? + 140 = 997
  8. 8.A train has 732 people in the front coaches and 130 people in the back coaches. How many people are on the train?
  9. 9.717 − ? = 396
  10. 10.111 + 410 =
  11. 11.A school has 856 children. 638 of them are girls. How many boys are there?
  12. 12.643 + 196 =
  13. 13.738 + ? = 962
  14. 14.A train has 816 people in the front coaches and 178 people in the back coaches. How many people are on the train?
  15. 15.673 + ? = 966
  16. 16.? − 119 = 298
  17. 17.462 − ? = 201
  18. 18.A train has 459 people in the front coaches and 370 people in the back coaches. How many people are on the train?
  19. 19.559 + 334 =
  20. 20.953 − 577 =
  21. 21.? + 559 = 703
  22. 22.A school has 829 children. 726 of them are girls. How many boys are there?
  23. 23.? + 514 = 985
  24. 24.302 − ? = 77
  25. 25.282 − ? = 124
  26. 26.173 + 221 =
  27. 27.208 − 124 =
  28. 28.293 − 178 =
  29. 29.457 − 386 =
  30. 30.A school has 432 children. 134 of them are girls. How many boys are there?
  31. 31.A train has 670 people in the front coaches and 260 people in the back coaches. How many people are on the train?
  32. 32.296 + 269 =
  33. 33.225 + ? = 879
  34. 34.306 − 248 =
  35. 35.? − 141 = 349
  36. 36.A school has 864 children. 206 of them are girls. How many boys are there?
  37. 37.479 + 222 =
  38. 38.277 + 264 =
  39. 39.382 + 166 =
  40. 40.612 + 245 =

Answer key

  1. 195
  2. 368
  3. 796
  4. 502
  5. 526
  6. 888
  7. 857
  8. 862
  9. 321
  10. 521
  11. 218
  12. 839
  13. 224
  14. 994
  15. 293
  16. 417
  17. 261
  18. 829
  19. 893
  20. 376
  21. 144
  22. 103
  23. 471
  24. 225
  25. 158
  26. 394
  27. 84
  28. 115
  29. 71
  30. 298
  31. 930
  32. 565
  33. 654
  34. 58
  35. 490
  36. 658
  37. 701
  38. 541
  39. 548
  40. 857

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