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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 180 · 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. 1.189 + 368 =
  2. 2.886 − 321 =
  3. 3.A school has 474 children. 422 of them are girls. How many boys are there?
  4. 4.577 + ? = 740
  5. 5.415 + 439 =
  6. 6.A train has 375 people in the front coaches and 249 people in the back coaches. How many people are on the train?
  7. 7.? + 279 = 714
  8. 8.A train has 439 people in the front coaches and 224 people in the back coaches. How many people are on the train?
  9. 9.A school has 659 children. 416 of them are girls. How many boys are there?
  10. 10.720 − 672 =
  11. 11.892 − 200 =
  12. 12.635 + 304 =
  13. 13.A school has 545 children. 145 of them are girls. How many boys are there?
  14. 14.665 + 328 =
  15. 15.? − 173 = 236
  16. 16.240 + 408 =
  17. 17.? + 409 = 637
  18. 18.A school has 294 children. 204 of them are girls. How many boys are there?
  19. 19.966 − ? = 683
  20. 20.626 + 289 =
  21. 21.448 − ? = 268
  22. 22.643 − ? = 477
  23. 23.A school has 823 children. 630 of them are girls. How many boys are there?
  24. 24.245 + 113 =
  25. 25.217 + 143 =
  26. 26.567 − ? = 119
  27. 27.334 + 413 =
  28. 28.? + 819 = 947
  29. 29.A school has 440 children. 179 of them are girls. How many boys are there?
  30. 30.A train has 828 people in the front coaches and 171 people in the back coaches. How many people are on the train?
  31. 31.645 + 301 =
  32. 32.702 − 610 =
  33. 33.? + 196 = 801
  34. 34.934 − ? = 51
  35. 35.257 + 733 =
  36. 36.866 − 410 =
  37. 37.494 − 487 =
  38. 38.A train has 807 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  39. 39.A school has 961 children. 427 of them are girls. How many boys are there?
  40. 40.437 + 352 =

Answer key

  1. 557
  2. 565
  3. 52
  4. 163
  5. 854
  6. 624
  7. 435
  8. 663
  9. 243
  10. 48
  11. 692
  12. 939
  13. 400
  14. 993
  15. 409
  16. 648
  17. 228
  18. 90
  19. 283
  20. 915
  21. 180
  22. 166
  23. 193
  24. 358
  25. 360
  26. 448
  27. 747
  28. 128
  29. 261
  30. 999
  31. 946
  32. 92
  33. 605
  34. 883
  35. 990
  36. 456
  37. 7
  38. 908
  39. 534
  40. 789

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