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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 999 · 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.? + 459 = 683
  2. 2.A train has 635 people in the front coaches and 159 people in the back coaches. How many people are on the train?
  3. 3.905 − ? = 536
  4. 4.A school has 432 children. 283 of them are girls. How many boys are there?
  5. 5.726 − ? = 541
  6. 6.528 + 186 =
  7. 7.A train has 204 people in the front coaches and 243 people in the back coaches. How many people are on the train?
  8. 8.? − 254 = 22
  9. 9.660 + 222 =
  10. 10.611 − 528 =
  11. 11.277 + 113 =
  12. 12.A train has 125 people in the front coaches and 156 people in the back coaches. How many people are on the train?
  13. 13.339 − 215 =
  14. 14.924 − ? = 630
  15. 15.866 − ? = 597
  16. 16.311 + 630 =
  17. 17.A train has 216 people in the front coaches and 585 people in the back coaches. How many people are on the train?
  18. 18.474 − 400 =
  19. 19.134 + 600 =
  20. 20.284 − 179 =
  21. 21.344 + 411 =
  22. 22.A school has 232 children. 132 of them are girls. How many boys are there?
  23. 23.954 − 925 =
  24. 24.? − 713 = 105
  25. 25.? − 487 = 440
  26. 26.A school has 583 children. 108 of them are girls. How many boys are there?
  27. 27.783 + ? = 933
  28. 28.648 − 259 =
  29. 29.328 + 308 =
  30. 30.530 + ? = 797
  31. 31.A train has 235 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  32. 32.A school has 481 children. 150 of them are girls. How many boys are there?
  33. 33.651 − 418 =
  34. 34.A train has 199 people in the front coaches and 433 people in the back coaches. How many people are on the train?
  35. 35.398 + 130 =
  36. 36.465 − 415 =
  37. 37.436 + 485 =
  38. 38.645 + 288 =
  39. 39.601 − 195 =
  40. 40.851 − 206 =

Answer key

  1. 224
  2. 794
  3. 369
  4. 149
  5. 185
  6. 714
  7. 447
  8. 276
  9. 882
  10. 83
  11. 390
  12. 281
  13. 124
  14. 294
  15. 269
  16. 941
  17. 801
  18. 74
  19. 734
  20. 105
  21. 755
  22. 100
  23. 29
  24. 818
  25. 927
  26. 475
  27. 150
  28. 389
  29. 636
  30. 267
  31. 360
  32. 331
  33. 233
  34. 632
  35. 528
  36. 50
  37. 921
  38. 933
  39. 406
  40. 645

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