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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 500 · 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. 1.819 + 174 =
  2. 2.? + 885 = 995
  3. 3.A train has 743 people in the front coaches and 152 people in the back coaches. How many people are on the train?
  4. 4.140 + 629 =
  5. 5.605 + 216 =
  6. 6.? − 415 = 562
  7. 7.655 − 597 =
  8. 8.810 − ? = 83
  9. 9.? + 637 = 821
  10. 10.718 − 219 =
  11. 11.A school has 386 children. 180 of them are girls. How many boys are there?
  12. 12.? − 205 = 243
  13. 13.276 + 482 =
  14. 14.? − 576 = 389
  15. 15.724 + ? = 867
  16. 16.A train has 675 people in the front coaches and 204 people in the back coaches. How many people are on the train?
  17. 17.389 − 236 =
  18. 18.625 − ? = 475
  19. 19.721 − 388 =
  20. 20.A train has 615 people in the front coaches and 194 people in the back coaches. How many people are on the train?
  21. 21.275 − 172 =
  22. 22.659 + 315 =
  23. 23.A train has 521 people in the front coaches and 407 people in the back coaches. How many people are on the train?
  24. 24.A school has 281 children. 105 of them are girls. How many boys are there?
  25. 25.A train has 125 people in the front coaches and 212 people in the back coaches. How many people are on the train?
  26. 26.A train has 812 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  27. 27.910 − ? = 391
  28. 28.? − 131 = 367
  29. 29.371 − ? = 123
  30. 30.849 + ? = 974
  31. 31.A train has 452 people in the front coaches and 398 people in the back coaches. How many people are on the train?
  32. 32.772 − ? = 451
  33. 33.A train has 137 people in the front coaches and 354 people in the back coaches. How many people are on the train?
  34. 34.349 − 167 =
  35. 35.340 − 287 =
  36. 36.193 + 411 =
  37. 37.199 + 210 =
  38. 38.775 − 764 =
  39. 39.? − 105 = 168
  40. 40.A train has 892 people in the front coaches and 103 people in the back coaches. How many people are on the train?

Answer key

  1. 993
  2. 110
  3. 895
  4. 769
  5. 821
  6. 977
  7. 58
  8. 727
  9. 184
  10. 499
  11. 206
  12. 448
  13. 758
  14. 965
  15. 143
  16. 879
  17. 153
  18. 150
  19. 333
  20. 809
  21. 103
  22. 974
  23. 928
  24. 176
  25. 337
  26. 920
  27. 519
  28. 498
  29. 248
  30. 125
  31. 850
  32. 321
  33. 491
  34. 182
  35. 53
  36. 604
  37. 409
  38. 11
  39. 273
  40. 995

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