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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 841 · 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.? − 190 = 170
  2. 2.A school has 499 children. 479 of them are girls. How many boys are there?
  3. 3.279 + 555 =
  4. 4.410 − 399 =
  5. 5.? − 301 = 542
  6. 6.104 + 333 =
  7. 7.A train has 229 people in the front coaches and 684 people in the back coaches. How many people are on the train?
  8. 8.A school has 680 children. 627 of them are girls. How many boys are there?
  9. 9.680 − ? = 316
  10. 10.? + 441 = 617
  11. 11.899 − 371 =
  12. 12.A school has 783 children. 373 of them are girls. How many boys are there?
  13. 13.397 + 351 =
  14. 14.? + 852 = 988
  15. 15.766 + 161 =
  16. 16.A train has 515 people in the front coaches and 425 people in the back coaches. How many people are on the train?
  17. 17.A train has 807 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  18. 18.172 + 241 =
  19. 19.518 − 276 =
  20. 20.? − 250 = 211
  21. 21.A train has 886 people in the front coaches and 112 people in the back coaches. How many people are on the train?
  22. 22.776 + 143 =
  23. 23.324 + 299 =
  24. 24.494 + ? = 797
  25. 25.282 + 352 =
  26. 26.? − 139 = 156
  27. 27.A train has 435 people in the front coaches and 248 people in the back coaches. How many people are on the train?
  28. 28.A train has 665 people in the front coaches and 278 people in the back coaches. How many people are on the train?
  29. 29.714 + 279 =
  30. 30.633 + 279 =
  31. 31.? + 235 = 551
  32. 32.585 + 117 =
  33. 33.465 + 281 =
  34. 34.837 − 737 =
  35. 35.? + 612 = 965
  36. 36.859 − 391 =
  37. 37.165 + 189 =
  38. 38.585 − ? = 71
  39. 39.214 + 648 =
  40. 40.A school has 581 children. 337 of them are girls. How many boys are there?

Answer key

  1. 360
  2. 20
  3. 834
  4. 11
  5. 843
  6. 437
  7. 913
  8. 53
  9. 364
  10. 176
  11. 528
  12. 410
  13. 748
  14. 136
  15. 927
  16. 940
  17. 912
  18. 413
  19. 242
  20. 461
  21. 998
  22. 919
  23. 623
  24. 303
  25. 634
  26. 295
  27. 683
  28. 943
  29. 993
  30. 912
  31. 316
  32. 702
  33. 746
  34. 100
  35. 353
  36. 468
  37. 354
  38. 514
  39. 862
  40. 244

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