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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 707 · 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 941 children. 216 of them are girls. How many boys are there?
  2. 2.393 − 284 =
  3. 3.894 + 103 =
  4. 4.443 − ? = 326
  5. 5.470 + ? = 815
  6. 6.629 − 490 =
  7. 7.651 + 344 =
  8. 8.850 + 113 =
  9. 9.326 + ? = 976
  10. 10.? + 596 = 741
  11. 11.569 + 177 =
  12. 12.223 − 161 =
  13. 13.A train has 106 people in the front coaches and 303 people in the back coaches. How many people are on the train?
  14. 14.923 − 621 =
  15. 15.A school has 669 children. 662 of them are girls. How many boys are there?
  16. 16.? + 610 = 849
  17. 17.A train has 864 people in the front coaches and 126 people in the back coaches. How many people are on the train?
  18. 18.A school has 283 children. 128 of them are girls. How many boys are there?
  19. 19.? − 452 = 118
  20. 20.545 − 453 =
  21. 21.690 + 103 =
  22. 22.437 + ? = 846
  23. 23.A train has 533 people in the front coaches and 436 people in the back coaches. How many people are on the train?
  24. 24.566 − ? = 270
  25. 25.A school has 987 children. 323 of them are girls. How many boys are there?
  26. 26.? − 756 = 186
  27. 27.378 − 272 =
  28. 28.792 − 560 =
  29. 29.A school has 512 children. 479 of them are girls. How many boys are there?
  30. 30.903 − 426 =
  31. 31.862 − 121 =
  32. 32.865 + 131 =
  33. 33.253 + ? = 880
  34. 34.A school has 677 children. 181 of them are girls. How many boys are there?
  35. 35.163 + 286 =
  36. 36.662 + ? = 963
  37. 37.263 + ? = 799
  38. 38.A train has 724 people in the front coaches and 240 people in the back coaches. How many people are on the train?
  39. 39.183 + 568 =
  40. 40.A train has 241 people in the front coaches and 342 people in the back coaches. How many people are on the train?

Answer key

  1. 725
  2. 109
  3. 997
  4. 117
  5. 345
  6. 139
  7. 995
  8. 963
  9. 650
  10. 145
  11. 746
  12. 62
  13. 409
  14. 302
  15. 7
  16. 239
  17. 990
  18. 155
  19. 570
  20. 92
  21. 793
  22. 409
  23. 969
  24. 296
  25. 664
  26. 942
  27. 106
  28. 232
  29. 33
  30. 477
  31. 741
  32. 996
  33. 627
  34. 496
  35. 449
  36. 301
  37. 536
  38. 964
  39. 751
  40. 583

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