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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 388 · 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. 1.731 − 205 =
  2. 2.488 − ? = 264
  3. 3.283 − 249 =
  4. 4.731 + 153 =
  5. 5.A school has 783 children. 432 of them are girls. How many boys are there?
  6. 6.843 + 136 =
  7. 7.338 + ? = 990
  8. 8.811 + ? = 921
  9. 9.A train has 107 people in the front coaches and 330 people in the back coaches. How many people are on the train?
  10. 10.769 + 113 =
  11. 11.A school has 709 children. 557 of them are girls. How many boys are there?
  12. 12.A school has 684 children. 600 of them are girls. How many boys are there?
  13. 13.? + 404 = 768
  14. 14.A train has 302 people in the front coaches and 434 people in the back coaches. How many people are on the train?
  15. 15.427 − ? = 267
  16. 16.391 + 400 =
  17. 17.180 + 559 =
  18. 18.? − 115 = 468
  19. 19.270 + 698 =
  20. 20.? + 112 = 815
  21. 21.734 − 473 =
  22. 22.A train has 889 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  23. 23.104 + ? = 271
  24. 24.894 + 105 =
  25. 25.348 + 409 =
  26. 26.925 − ? = 736
  27. 27.A train has 542 people in the front coaches and 385 people in the back coaches. How many people are on the train?
  28. 28.A train has 811 people in the front coaches and 123 people in the back coaches. How many people are on the train?
  29. 29.A train has 844 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  30. 30.? + 130 = 974
  31. 31.814 − 252 =
  32. 32.646 + 230 =
  33. 33.A train has 215 people in the front coaches and 199 people in the back coaches. How many people are on the train?
  34. 34.? − 437 = 100
  35. 35.A train has 878 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  36. 36.? + 447 = 732
  37. 37.? − 444 = 159
  38. 38.542 + 155 =
  39. 39.717 + 162 =
  40. 40.368 + 480 =

Answer key

  1. 526
  2. 224
  3. 34
  4. 884
  5. 351
  6. 979
  7. 652
  8. 110
  9. 437
  10. 882
  11. 152
  12. 84
  13. 364
  14. 736
  15. 160
  16. 791
  17. 739
  18. 583
  19. 968
  20. 703
  21. 261
  22. 996
  23. 167
  24. 999
  25. 757
  26. 189
  27. 927
  28. 934
  29. 945
  30. 844
  31. 562
  32. 876
  33. 414
  34. 537
  35. 993
  36. 285
  37. 603
  38. 697
  39. 879
  40. 848

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