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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 728 · 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.A school has 261 children. 245 of them are girls. How many boys are there?
  2. 2.? + 770 = 871
  3. 3.A school has 943 children. 622 of them are girls. How many boys are there?
  4. 4.212 + 358 =
  5. 5.338 − ? = 238
  6. 6.531 + ? = 697
  7. 7.258 − ? = 88
  8. 8.A train has 266 people in the front coaches and 308 people in the back coaches. How many people are on the train?
  9. 9.A train has 112 people in the front coaches and 712 people in the back coaches. How many people are on the train?
  10. 10.959 − 730 =
  11. 11.794 − 339 =
  12. 12.? − 236 = 185
  13. 13.707 + ? = 991
  14. 14.780 − 383 =
  15. 15.728 − ? = 457
  16. 16.206 − 101 =
  17. 17.A train has 496 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  18. 18.536 + 175 =
  19. 19.A train has 432 people in the front coaches and 472 people in the back coaches. How many people are on the train?
  20. 20.778 + ? = 894
  21. 21.464 + 316 =
  22. 22.A school has 239 children. 165 of them are girls. How many boys are there?
  23. 23.868 − ? = 398
  24. 24.835 + 112 =
  25. 25.459 + ? = 941
  26. 26.297 − ? = 70
  27. 27.490 − 397 =
  28. 28.373 + ? = 806
  29. 29.A train has 508 people in the front coaches and 393 people in the back coaches. How many people are on the train?
  30. 30.517 + 298 =
  31. 31.886 + 107 =
  32. 32.A school has 900 children. 417 of them are girls. How many boys are there?
  33. 33.971 − 468 =
  34. 34.? − 436 = 336
  35. 35.713 − ? = 524
  36. 36.476 + 115 =
  37. 37.690 + ? = 970
  38. 38.? + 643 = 781
  39. 39.A train has 360 people in the front coaches and 417 people in the back coaches. How many people are on the train?
  40. 40.662 + 146 =

Answer key

  1. 16
  2. 101
  3. 321
  4. 570
  5. 100
  6. 166
  7. 170
  8. 574
  9. 824
  10. 229
  11. 455
  12. 421
  13. 284
  14. 397
  15. 271
  16. 105
  17. 617
  18. 711
  19. 904
  20. 116
  21. 780
  22. 74
  23. 470
  24. 947
  25. 482
  26. 227
  27. 93
  28. 433
  29. 901
  30. 815
  31. 993
  32. 483
  33. 503
  34. 772
  35. 189
  36. 591
  37. 280
  38. 138
  39. 777
  40. 808

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