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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 320 · 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 281 children. 150 of them are girls. How many boys are there?
  2. 2.? + 552 = 884
  3. 3.258 + 198 =
  4. 4.A train has 211 people in the front coaches and 749 people in the back coaches. How many people are on the train?
  5. 5.? − 295 = 627
  6. 6.A train has 230 people in the front coaches and 627 people in the back coaches. How many people are on the train?
  7. 7.172 + ? = 463
  8. 8.543 + 173 =
  9. 9.A school has 773 children. 177 of them are girls. How many boys are there?
  10. 10.? − 114 = 178
  11. 11.936 − 832 =
  12. 12.? + 672 = 835
  13. 13.A school has 449 children. 307 of them are girls. How many boys are there?
  14. 14.829 + 115 =
  15. 15.A school has 258 children. 252 of them are girls. How many boys are there?
  16. 16.277 − ? = 101
  17. 17.433 + 109 =
  18. 18.752 − 346 =
  19. 19.A school has 308 children. 195 of them are girls. How many boys are there?
  20. 20.? − 111 = 528
  21. 21.341 + ? = 877
  22. 22.A train has 422 people in the front coaches and 357 people in the back coaches. How many people are on the train?
  23. 23.A train has 629 people in the front coaches and 264 people in the back coaches. How many people are on the train?
  24. 24.A school has 776 children. 433 of them are girls. How many boys are there?
  25. 25.390 − ? = 52
  26. 26.706 − ? = 309
  27. 27.504 + 166 =
  28. 28.A train has 160 people in the front coaches and 622 people in the back coaches. How many people are on the train?
  29. 29.? + 250 = 722
  30. 30.? − 146 = 446
  31. 31.432 + 296 =
  32. 32.509 − 350 =
  33. 33.131 + 509 =
  34. 34.A school has 649 children. 413 of them are girls. How many boys are there?
  35. 35.A school has 759 children. 719 of them are girls. How many boys are there?
  36. 36.440 + ? = 756
  37. 37.A train has 353 people in the front coaches and 389 people in the back coaches. How many people are on the train?
  38. 38.471 − 393 =
  39. 39.520 − ? = 376
  40. 40.A train has 490 people in the front coaches and 218 people in the back coaches. How many people are on the train?

Answer key

  1. 131
  2. 332
  3. 456
  4. 960
  5. 922
  6. 857
  7. 291
  8. 716
  9. 596
  10. 292
  11. 104
  12. 163
  13. 142
  14. 944
  15. 6
  16. 176
  17. 542
  18. 406
  19. 113
  20. 639
  21. 536
  22. 779
  23. 893
  24. 343
  25. 338
  26. 397
  27. 670
  28. 782
  29. 472
  30. 592
  31. 728
  32. 159
  33. 640
  34. 236
  35. 40
  36. 316
  37. 742
  38. 78
  39. 144
  40. 708

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