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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 924 · 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. 1.146 + ? = 280
  2. 2.566 − 200 =
  3. 3.777 − 362 =
  4. 4.A school has 334 children. 297 of them are girls. How many boys are there?
  5. 5.375 + 174 =
  6. 6.A train has 547 people in the front coaches and 363 people in the back coaches. How many people are on the train?
  7. 7.? + 441 = 693
  8. 8.A school has 650 children. 283 of them are girls. How many boys are there?
  9. 9.700 + ? = 871
  10. 10.132 + 411 =
  11. 11.821 − 680 =
  12. 12.572 + 267 =
  13. 13.? + 455 = 705
  14. 14.457 − 348 =
  15. 15.213 − 130 =
  16. 16.A school has 766 children. 573 of them are girls. How many boys are there?
  17. 17.300 + ? = 607
  18. 18.214 + 139 =
  19. 19.429 − 206 =
  20. 20.568 + 418 =
  21. 21.A train has 438 people in the front coaches and 422 people in the back coaches. How many people are on the train?
  22. 22.? − 684 = 192
  23. 23.? − 303 = 278
  24. 24.A school has 298 children. 243 of them are girls. How many boys are there?
  25. 25.A school has 688 children. 344 of them are girls. How many boys are there?
  26. 26.A school has 493 children. 428 of them are girls. How many boys are there?
  27. 27.672 + 186 =
  28. 28.A school has 774 children. 454 of them are girls. How many boys are there?
  29. 29.? − 147 = 621
  30. 30.356 − 169 =
  31. 31.395 + ? = 764
  32. 32.A school has 998 children. 908 of them are girls. How many boys are there?
  33. 33.537 − 141 =
  34. 34.873 − ? = 279
  35. 35.265 − 243 =
  36. 36.? − 348 = 377
  37. 37.A school has 922 children. 716 of them are girls. How many boys are there?
  38. 38.491 + 125 =
  39. 39.? + 193 = 532
  40. 40.A school has 660 children. 407 of them are girls. How many boys are there?

Answer key

  1. 134
  2. 366
  3. 415
  4. 37
  5. 549
  6. 910
  7. 252
  8. 367
  9. 171
  10. 543
  11. 141
  12. 839
  13. 250
  14. 109
  15. 83
  16. 193
  17. 307
  18. 353
  19. 223
  20. 986
  21. 860
  22. 876
  23. 581
  24. 55
  25. 344
  26. 65
  27. 858
  28. 320
  29. 768
  30. 187
  31. 369
  32. 90
  33. 396
  34. 594
  35. 22
  36. 725
  37. 206
  38. 616
  39. 339
  40. 253

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