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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 721 · 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. 1.457 + ? = 988
  2. 2.358 − 346 =
  3. 3.212 + ? = 466
  4. 4.625 − ? = 8
  5. 5.A train has 315 people in the front coaches and 625 people in the back coaches. How many people are on the train?
  6. 6.830 − 198 =
  7. 7.A train has 733 people in the front coaches and 141 people in the back coaches. How many people are on the train?
  8. 8.295 − 141 =
  9. 9.? − 411 = 449
  10. 10.378 + 157 =
  11. 11.751 + 115 =
  12. 12.765 − 125 =
  13. 13.267 + 403 =
  14. 14.A school has 674 children. 344 of them are girls. How many boys are there?
  15. 15.797 − 562 =
  16. 16.A train has 577 people in the front coaches and 200 people in the back coaches. How many people are on the train?
  17. 17.909 − 317 =
  18. 18.196 + 178 =
  19. 19.131 + ? = 875
  20. 20.732 + 117 =
  21. 21.737 + 218 =
  22. 22.A school has 884 children. 465 of them are girls. How many boys are there?
  23. 23.A school has 543 children. 171 of them are girls. How many boys are there?
  24. 24.? + 481 = 926
  25. 25.? + 848 = 955
  26. 26.A train has 234 people in the front coaches and 408 people in the back coaches. How many people are on the train?
  27. 27.A train has 162 people in the front coaches and 783 people in the back coaches. How many people are on the train?
  28. 28.165 + 453 =
  29. 29.? + 638 = 991
  30. 30.A train has 135 people in the front coaches and 689 people in the back coaches. How many people are on the train?
  31. 31.A train has 159 people in the front coaches and 192 people in the back coaches. How many people are on the train?
  32. 32.? − 144 = 739
  33. 33.763 + 197 =
  34. 34.832 − ? = 426
  35. 35.295 + 546 =
  36. 36.407 − ? = 62
  37. 37.487 − ? = 92
  38. 38.A school has 523 children. 191 of them are girls. How many boys are there?
  39. 39.518 + 204 =
  40. 40.648 − 385 =

Answer key

  1. 531
  2. 12
  3. 254
  4. 617
  5. 940
  6. 632
  7. 874
  8. 154
  9. 860
  10. 535
  11. 866
  12. 640
  13. 670
  14. 330
  15. 235
  16. 777
  17. 592
  18. 374
  19. 744
  20. 849
  21. 955
  22. 419
  23. 372
  24. 445
  25. 107
  26. 642
  27. 945
  28. 618
  29. 353
  30. 824
  31. 351
  32. 883
  33. 960
  34. 406
  35. 841
  36. 345
  37. 395
  38. 332
  39. 722
  40. 263

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