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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 669 · 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. 1.479 − ? = 81
  2. 2.850 + ? = 993
  3. 3.336 + 615 =
  4. 4.234 + 252 =
  5. 5.? − 185 = 163
  6. 6.309 − 187 =
  7. 7.120 + 563 =
  8. 8.A school has 874 children. 219 of them are girls. How many boys are there?
  9. 9.336 + ? = 818
  10. 10.A train has 272 people in the front coaches and 548 people in the back coaches. How many people are on the train?
  11. 11.350 − 164 =
  12. 12.A train has 793 people in the front coaches and 172 people in the back coaches. How many people are on the train?
  13. 13.780 − 206 =
  14. 14.? − 474 = 482
  15. 15.A school has 372 children. 259 of them are girls. How many boys are there?
  16. 16.479 − 211 =
  17. 17.851 − 221 =
  18. 18.? − 689 = 25
  19. 19.A school has 812 children. 501 of them are girls. How many boys are there?
  20. 20.A school has 714 children. 463 of them are girls. How many boys are there?
  21. 21.? − 358 = 64
  22. 22.731 − 381 =
  23. 23.A school has 426 children. 168 of them are girls. How many boys are there?
  24. 24.512 − 276 =
  25. 25.? − 228 = 224
  26. 26.A train has 255 people in the front coaches and 670 people in the back coaches. How many people are on the train?
  27. 27.832 + 135 =
  28. 28.A school has 671 children. 426 of them are girls. How many boys are there?
  29. 29.A train has 292 people in the front coaches and 134 people in the back coaches. How many people are on the train?
  30. 30.354 − 273 =
  31. 31.295 − 109 =
  32. 32.299 + ? = 583
  33. 33.A school has 746 children. 285 of them are girls. How many boys are there?
  34. 34.A train has 749 people in the front coaches and 185 people in the back coaches. How many people are on the train?
  35. 35.687 + ? = 882
  36. 36.115 + 416 =
  37. 37.? − 700 = 10
  38. 38.? − 139 = 200
  39. 39.618 + ? = 731
  40. 40.A train has 244 people in the front coaches and 636 people in the back coaches. How many people are on the train?

Answer key

  1. 398
  2. 143
  3. 951
  4. 486
  5. 348
  6. 122
  7. 683
  8. 655
  9. 482
  10. 820
  11. 186
  12. 965
  13. 574
  14. 956
  15. 113
  16. 268
  17. 630
  18. 714
  19. 311
  20. 251
  21. 422
  22. 350
  23. 258
  24. 236
  25. 452
  26. 925
  27. 967
  28. 245
  29. 426
  30. 81
  31. 186
  32. 284
  33. 461
  34. 934
  35. 195
  36. 531
  37. 710
  38. 339
  39. 113
  40. 880

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