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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 729 · 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. 1.700 − ? = 169
  2. 2.A train has 262 people in the front coaches and 403 people in the back coaches. How many people are on the train?
  3. 3.A school has 593 children. 272 of them are girls. How many boys are there?
  4. 4.? − 546 = 159
  5. 5.A school has 489 children. 206 of them are girls. How many boys are there?
  6. 6.? + 359 = 708
  7. 7.307 − ? = 176
  8. 8.601 − 215 =
  9. 9.597 − 206 =
  10. 10.217 − ? = 94
  11. 11.456 − 194 =
  12. 12.231 + 513 =
  13. 13.161 + ? = 448
  14. 14.106 + 139 =
  15. 15.A school has 940 children. 443 of them are girls. How many boys are there?
  16. 16.A train has 472 people in the front coaches and 185 people in the back coaches. How many people are on the train?
  17. 17.A train has 393 people in the front coaches and 571 people in the back coaches. How many people are on the train?
  18. 18.324 − 245 =
  19. 19.850 − 244 =
  20. 20.807 − 609 =
  21. 21.354 − ? = 246
  22. 22.675 − 342 =
  23. 23.757 + 139 =
  24. 24.A school has 490 children. 160 of them are girls. How many boys are there?
  25. 25.A school has 312 children. 241 of them are girls. How many boys are there?
  26. 26.661 − 211 =
  27. 27.546 − 191 =
  28. 28.749 − ? = 10
  29. 29.649 + 256 =
  30. 30.897 − 598 =
  31. 31.789 + 137 =
  32. 32.A train has 620 people in the front coaches and 326 people in the back coaches. How many people are on the train?
  33. 33.697 − 113 =
  34. 34.? + 279 = 514
  35. 35.348 + 211 =
  36. 36.283 + ? = 862
  37. 37.A school has 367 children. 323 of them are girls. How many boys are there?
  38. 38.395 − ? = 272
  39. 39.158 + 350 =
  40. 40.A train has 735 people in the front coaches and 176 people in the back coaches. How many people are on the train?

Answer key

  1. 531
  2. 665
  3. 321
  4. 705
  5. 283
  6. 349
  7. 131
  8. 386
  9. 391
  10. 123
  11. 262
  12. 744
  13. 287
  14. 245
  15. 497
  16. 657
  17. 964
  18. 79
  19. 606
  20. 198
  21. 108
  22. 333
  23. 896
  24. 330
  25. 71
  26. 450
  27. 355
  28. 739
  29. 905
  30. 299
  31. 926
  32. 946
  33. 584
  34. 235
  35. 559
  36. 579
  37. 44
  38. 123
  39. 508
  40. 911

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