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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 98 · 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 478 people in the front coaches and 398 people in the back coaches. How many people are on the train?
  2. 2.664 + 180 =
  3. 3.A train has 112 people in the front coaches and 131 people in the back coaches. How many people are on the train?
  4. 4.A school has 691 children. 508 of them are girls. How many boys are there?
  5. 5.794 − ? = 166
  6. 6.306 + 481 =
  7. 7.175 + ? = 397
  8. 8.? − 218 = 141
  9. 9.A school has 973 children. 408 of them are girls. How many boys are there?
  10. 10.360 − ? = 216
  11. 11.351 − 135 =
  12. 12.574 + ? = 852
  13. 13.842 − 397 =
  14. 14.? − 670 = 179
  15. 15.328 + 421 =
  16. 16.781 − 270 =
  17. 17.324 − 314 =
  18. 18.621 + 355 =
  19. 19.623 + ? = 826
  20. 20.A school has 373 children. 280 of them are girls. How many boys are there?
  21. 21.? + 324 = 443
  22. 22.503 − ? = 327
  23. 23.A school has 933 children. 305 of them are girls. How many boys are there?
  24. 24.393 − ? = 211
  25. 25.324 + 123 =
  26. 26.A train has 121 people in the front coaches and 683 people in the back coaches. How many people are on the train?
  27. 27.518 − ? = 216
  28. 28.226 − ? = 23
  29. 29.885 + 102 =
  30. 30.403 + 339 =
  31. 31.? − 229 = 535
  32. 32.? − 289 = 581
  33. 33.855 − ? = 543
  34. 34.? − 129 = 430
  35. 35.? + 150 = 451
  36. 36.A school has 931 children. 595 of them are girls. How many boys are there?
  37. 37.409 − ? = 267
  38. 38.633 + 335 =
  39. 39.352 + 208 =
  40. 40.A train has 159 people in the front coaches and 729 people in the back coaches. How many people are on the train?

Answer key

  1. 876
  2. 844
  3. 243
  4. 183
  5. 628
  6. 787
  7. 222
  8. 359
  9. 565
  10. 144
  11. 216
  12. 278
  13. 445
  14. 849
  15. 749
  16. 511
  17. 10
  18. 976
  19. 203
  20. 93
  21. 119
  22. 176
  23. 628
  24. 182
  25. 447
  26. 804
  27. 302
  28. 203
  29. 987
  30. 742
  31. 764
  32. 870
  33. 312
  34. 559
  35. 301
  36. 336
  37. 142
  38. 968
  39. 560
  40. 888

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