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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 756 · 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 train has 204 people in the front coaches and 589 people in the back coaches. How many people are on the train?
  2. 2.325 + 344 =
  3. 3.378 + 188 =
  4. 4.138 + 375 =
  5. 5.? − 117 = 383
  6. 6.420 + 515 =
  7. 7.A train has 343 people in the front coaches and 558 people in the back coaches. How many people are on the train?
  8. 8.A school has 556 children. 182 of them are girls. How many boys are there?
  9. 9.A train has 855 people in the front coaches and 133 people in the back coaches. How many people are on the train?
  10. 10.A train has 158 people in the front coaches and 455 people in the back coaches. How many people are on the train?
  11. 11.913 − 409 =
  12. 12.A train has 707 people in the front coaches and 184 people in the back coaches. How many people are on the train?
  13. 13.? + 706 = 866
  14. 14.206 + 206 =
  15. 15.678 + 264 =
  16. 16.204 − 107 =
  17. 17.581 + ? = 839
  18. 18.A school has 492 children. 295 of them are girls. How many boys are there?
  19. 19.247 − 244 =
  20. 20.142 + 181 =
  21. 21.A train has 132 people in the front coaches and 161 people in the back coaches. How many people are on the train?
  22. 22.219 + 562 =
  23. 23.? + 523 = 841
  24. 24.? − 196 = 756
  25. 25.A school has 432 children. 123 of them are girls. How many boys are there?
  26. 26.644 − ? = 235
  27. 27.806 + ? = 915
  28. 28.686 − ? = 180
  29. 29.A train has 199 people in the front coaches and 149 people in the back coaches. How many people are on the train?
  30. 30.A school has 792 children. 137 of them are girls. How many boys are there?
  31. 31.A school has 536 children. 302 of them are girls. How many boys are there?
  32. 32.872 − 437 =
  33. 33.732 − ? = 443
  34. 34.633 + 271 =
  35. 35.671 + 311 =
  36. 36.824 + 113 =
  37. 37.? + 156 = 354
  38. 38.524 + ? = 882
  39. 39.? − 459 = 466
  40. 40.684 + 156 =

Answer key

  1. 793
  2. 669
  3. 566
  4. 513
  5. 500
  6. 935
  7. 901
  8. 374
  9. 988
  10. 613
  11. 504
  12. 891
  13. 160
  14. 412
  15. 942
  16. 97
  17. 258
  18. 197
  19. 3
  20. 323
  21. 293
  22. 781
  23. 318
  24. 952
  25. 309
  26. 409
  27. 109
  28. 506
  29. 348
  30. 655
  31. 234
  32. 435
  33. 289
  34. 904
  35. 982
  36. 937
  37. 198
  38. 358
  39. 925
  40. 840

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