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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 400 · 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.? − 352 = 16
  2. 2.298 + ? = 926
  3. 3.442 − ? = 297
  4. 4.A school has 985 children. 801 of them are girls. How many boys are there?
  5. 5.198 + 676 =
  6. 6.822 − ? = 453
  7. 7.428 − ? = 45
  8. 8.742 − ? = 150
  9. 9.327 + 430 =
  10. 10.170 + ? = 638
  11. 11.828 + 152 =
  12. 12.A train has 357 people in the front coaches and 228 people in the back coaches. How many people are on the train?
  13. 13.477 − ? = 90
  14. 14.A train has 516 people in the front coaches and 316 people in the back coaches. How many people are on the train?
  15. 15.A school has 630 children. 472 of them are girls. How many boys are there?
  16. 16.386 + 591 =
  17. 17.? − 366 = 12
  18. 18.A school has 651 children. 383 of them are girls. How many boys are there?
  19. 19.881 + ? = 991
  20. 20.A train has 478 people in the front coaches and 198 people in the back coaches. How many people are on the train?
  21. 21.691 + ? = 920
  22. 22.? − 199 = 686
  23. 23.210 − 128 =
  24. 24.? − 446 = 251
  25. 25.277 + ? = 426
  26. 26.A train has 318 people in the front coaches and 506 people in the back coaches. How many people are on the train?
  27. 27.982 − 273 =
  28. 28.683 − 216 =
  29. 29.633 − 477 =
  30. 30.A school has 426 children. 140 of them are girls. How many boys are there?
  31. 31.153 + ? = 645
  32. 32.836 + 120 =
  33. 33.284 + 301 =
  34. 34.320 + 331 =
  35. 35.A train has 312 people in the front coaches and 622 people in the back coaches. How many people are on the train?
  36. 36.215 + ? = 457
  37. 37.311 − 134 =
  38. 38.A school has 225 children. 193 of them are girls. How many boys are there?
  39. 39.A school has 517 children. 370 of them are girls. How many boys are there?
  40. 40.A train has 664 people in the front coaches and 162 people in the back coaches. How many people are on the train?

Answer key

  1. 368
  2. 628
  3. 145
  4. 184
  5. 874
  6. 369
  7. 383
  8. 592
  9. 757
  10. 468
  11. 980
  12. 585
  13. 387
  14. 832
  15. 158
  16. 977
  17. 378
  18. 268
  19. 110
  20. 676
  21. 229
  22. 885
  23. 82
  24. 697
  25. 149
  26. 824
  27. 709
  28. 467
  29. 156
  30. 286
  31. 492
  32. 956
  33. 585
  34. 651
  35. 934
  36. 242
  37. 177
  38. 32
  39. 147
  40. 826

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