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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 829 · 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. 1.344 − ? = 97
  2. 2.176 + 270 =
  3. 3.252 − 175 =
  4. 4.347 − 311 =
  5. 5.599 + 165 =
  6. 6.A school has 649 children. 496 of them are girls. How many boys are there?
  7. 7.811 + 184 =
  8. 8.172 + 799 =
  9. 9.206 − 110 =
  10. 10.912 − 381 =
  11. 11.A train has 215 people in the front coaches and 396 people in the back coaches. How many people are on the train?
  12. 12.A school has 390 children. 286 of them are girls. How many boys are there?
  13. 13.253 + 228 =
  14. 14.A train has 484 people in the front coaches and 343 people in the back coaches. How many people are on the train?
  15. 15.743 − 229 =
  16. 16.821 + ? = 955
  17. 17.A train has 281 people in the front coaches and 158 people in the back coaches. How many people are on the train?
  18. 18.555 + 396 =
  19. 19.854 − 135 =
  20. 20.? − 862 = 69
  21. 21.A school has 384 children. 202 of them are girls. How many boys are there?
  22. 22.701 + 226 =
  23. 23.433 + 291 =
  24. 24.A school has 683 children. 340 of them are girls. How many boys are there?
  25. 25.489 − ? = 85
  26. 26.540 − 318 =
  27. 27.317 − 243 =
  28. 28.A train has 700 people in the front coaches and 164 people in the back coaches. How many people are on the train?
  29. 29.A school has 358 children. 223 of them are girls. How many boys are there?
  30. 30.? + 654 = 760
  31. 31.599 + ? = 932
  32. 32.482 − 175 =
  33. 33.511 − ? = 294
  34. 34.878 + 107 =
  35. 35.931 − 185 =
  36. 36.? − 748 = 81
  37. 37.326 + ? = 683
  38. 38.A train has 224 people in the front coaches and 684 people in the back coaches. How many people are on the train?
  39. 39.A train has 897 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  40. 40.578 − 483 =

Answer key

  1. 247
  2. 446
  3. 77
  4. 36
  5. 764
  6. 153
  7. 995
  8. 971
  9. 96
  10. 531
  11. 611
  12. 104
  13. 481
  14. 827
  15. 514
  16. 134
  17. 439
  18. 951
  19. 719
  20. 931
  21. 182
  22. 927
  23. 724
  24. 343
  25. 404
  26. 222
  27. 74
  28. 864
  29. 135
  30. 106
  31. 333
  32. 307
  33. 217
  34. 985
  35. 746
  36. 829
  37. 357
  38. 908
  39. 998
  40. 95

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