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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 534 · 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. 1.894 + 101 =
  2. 2.? − 326 = 29
  3. 3.301 + 362 =
  4. 4.A school has 860 children. 413 of them are girls. How many boys are there?
  5. 5.? + 340 = 506
  6. 6.481 − 133 =
  7. 7.213 − ? = 67
  8. 8.A school has 526 children. 368 of them are girls. How many boys are there?
  9. 9.A train has 795 people in the front coaches and 179 people in the back coaches. How many people are on the train?
  10. 10.202 − 173 =
  11. 11.297 − 291 =
  12. 12.A school has 384 children. 204 of them are girls. How many boys are there?
  13. 13.677 − 672 =
  14. 14.A school has 766 children. 405 of them are girls. How many boys are there?
  15. 15.? − 117 = 101
  16. 16.A school has 341 children. 253 of them are girls. How many boys are there?
  17. 17.865 + ? = 993
  18. 18.460 + 385 =
  19. 19.? + 141 = 831
  20. 20.A train has 395 people in the front coaches and 428 people in the back coaches. How many people are on the train?
  21. 21.124 + ? = 877
  22. 22.530 − 315 =
  23. 23.558 − 205 =
  24. 24.A school has 799 children. 533 of them are girls. How many boys are there?
  25. 25.? + 786 = 930
  26. 26.? − 311 = 272
  27. 27.850 + 107 =
  28. 28.438 − 123 =
  29. 29.882 − 255 =
  30. 30.293 + ? = 448
  31. 31.655 + 225 =
  32. 32.862 − 200 =
  33. 33.771 − 370 =
  34. 34.? + 883 = 993
  35. 35.A school has 453 children. 426 of them are girls. How many boys are there?
  36. 36.A train has 566 people in the front coaches and 353 people in the back coaches. How many people are on the train?
  37. 37.A school has 880 children. 136 of them are girls. How many boys are there?
  38. 38.256 − 186 =
  39. 39.359 + 448 =
  40. 40.359 − ? = 97

Answer key

  1. 995
  2. 355
  3. 663
  4. 447
  5. 166
  6. 348
  7. 146
  8. 158
  9. 974
  10. 29
  11. 6
  12. 180
  13. 5
  14. 361
  15. 218
  16. 88
  17. 128
  18. 845
  19. 690
  20. 823
  21. 753
  22. 215
  23. 353
  24. 266
  25. 144
  26. 583
  27. 957
  28. 315
  29. 627
  30. 155
  31. 880
  32. 662
  33. 401
  34. 110
  35. 27
  36. 919
  37. 744
  38. 70
  39. 807
  40. 262

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