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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 692 · 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. 1.228 + 220 =
  2. 2.253 − 108 =
  3. 3.502 + ? = 916
  4. 4.399 + 256 =
  5. 5.724 + 178 =
  6. 6.819 − 130 =
  7. 7.930 − 586 =
  8. 8.268 + ? = 560
  9. 9.624 + 268 =
  10. 10.A train has 888 people in the front coaches and 110 people in the back coaches. How many people are on the train?
  11. 11.A train has 338 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  12. 12.167 + 746 =
  13. 13.735 − 659 =
  14. 14.524 − ? = 420
  15. 15.925 − 397 =
  16. 16.? + 286 = 849
  17. 17.A school has 445 children. 140 of them are girls. How many boys are there?
  18. 18.A school has 721 children. 346 of them are girls. How many boys are there?
  19. 19.? + 369 = 877
  20. 20.A train has 148 people in the front coaches and 537 people in the back coaches. How many people are on the train?
  21. 21.A school has 805 children. 411 of them are girls. How many boys are there?
  22. 22.? + 252 = 862
  23. 23.824 + 145 =
  24. 24.256 + 198 =
  25. 25.? − 161 = 351
  26. 26.959 − 389 =
  27. 27.? − 706 = 3
  28. 28.A train has 243 people in the front coaches and 232 people in the back coaches. How many people are on the train?
  29. 29.187 + 796 =
  30. 30.? + 244 = 733
  31. 31.216 + 179 =
  32. 32.A train has 123 people in the front coaches and 664 people in the back coaches. How many people are on the train?
  33. 33.442 − 171 =
  34. 34.A school has 858 children. 171 of them are girls. How many boys are there?
  35. 35.A school has 286 children. 275 of them are girls. How many boys are there?
  36. 36.? − 323 = 7
  37. 37.386 + 503 =
  38. 38.751 − ? = 273
  39. 39.A school has 365 children. 349 of them are girls. How many boys are there?
  40. 40.? + 280 = 424

Answer key

  1. 448
  2. 145
  3. 414
  4. 655
  5. 902
  6. 689
  7. 344
  8. 292
  9. 892
  10. 998
  11. 463
  12. 913
  13. 76
  14. 104
  15. 528
  16. 563
  17. 305
  18. 375
  19. 508
  20. 685
  21. 394
  22. 610
  23. 969
  24. 454
  25. 512
  26. 570
  27. 709
  28. 475
  29. 983
  30. 489
  31. 395
  32. 787
  33. 271
  34. 687
  35. 11
  36. 330
  37. 889
  38. 478
  39. 16
  40. 144

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