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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 407 · 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. 1.696 + ? = 947
  2. 2.443 + ? = 658
  3. 3.208 − 135 =
  4. 4.282 + 238 =
  5. 5.? − 529 = 54
  6. 6.A school has 562 children. 343 of them are girls. How many boys are there?
  7. 7.A school has 284 children. 197 of them are girls. How many boys are there?
  8. 8.462 − 405 =
  9. 9.522 − 258 =
  10. 10.562 + ? = 818
  11. 11.511 + ? = 860
  12. 12.409 + 578 =
  13. 13.496 − ? = 329
  14. 14.272 − 252 =
  15. 15.495 + 183 =
  16. 16.581 + 289 =
  17. 17.? + 845 = 970
  18. 18.? − 519 = 451
  19. 19.743 + 114 =
  20. 20.A train has 510 people in the front coaches and 477 people in the back coaches. How many people are on the train?
  21. 21.901 − 419 =
  22. 22.A train has 310 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  23. 23.380 − ? = 261
  24. 24.202 + 744 =
  25. 25.A school has 788 children. 177 of them are girls. How many boys are there?
  26. 26.267 − 154 =
  27. 27.? − 509 = 425
  28. 28.A train has 283 people in the front coaches and 608 people in the back coaches. How many people are on the train?
  29. 29.A train has 631 people in the front coaches and 264 people in the back coaches. How many people are on the train?
  30. 30.319 + 268 =
  31. 31.551 − 377 =
  32. 32.218 − 155 =
  33. 33.862 + ? = 987
  34. 34.A train has 239 people in the front coaches and 183 people in the back coaches. How many people are on the train?
  35. 35.312 + ? = 787
  36. 36.A train has 297 people in the front coaches and 672 people in the back coaches. How many people are on the train?
  37. 37.648 + 170 =
  38. 38.427 − 136 =
  39. 39.548 − 243 =
  40. 40.A school has 671 children. 442 of them are girls. How many boys are there?

Answer key

  1. 251
  2. 215
  3. 73
  4. 520
  5. 583
  6. 219
  7. 87
  8. 57
  9. 264
  10. 256
  11. 349
  12. 987
  13. 167
  14. 20
  15. 678
  16. 870
  17. 125
  18. 970
  19. 857
  20. 987
  21. 482
  22. 425
  23. 119
  24. 946
  25. 611
  26. 113
  27. 934
  28. 891
  29. 895
  30. 587
  31. 174
  32. 63
  33. 125
  34. 422
  35. 475
  36. 969
  37. 818
  38. 291
  39. 305
  40. 229

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