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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 102 · 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 school has 749 children. 250 of them are girls. How many boys are there?
  2. 2.? − 268 = 499
  3. 3.A train has 390 people in the front coaches and 140 people in the back coaches. How many people are on the train?
  4. 4.798 − 285 =
  5. 5.A school has 825 children. 636 of them are girls. How many boys are there?
  6. 6.A train has 824 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  7. 7.A school has 273 children. 162 of them are girls. How many boys are there?
  8. 8.A train has 819 people in the front coaches and 166 people in the back coaches. How many people are on the train?
  9. 9.503 − 193 =
  10. 10.648 + 296 =
  11. 11.698 − ? = 218
  12. 12.681 − 488 =
  13. 13.A train has 712 people in the front coaches and 133 people in the back coaches. How many people are on the train?
  14. 14.170 + 724 =
  15. 15.521 + ? = 659
  16. 16.185 + 289 =
  17. 17.340 − 337 =
  18. 18.601 + 346 =
  19. 19.A school has 935 children. 142 of them are girls. How many boys are there?
  20. 20.A school has 440 children. 328 of them are girls. How many boys are there?
  21. 21.186 + ? = 384
  22. 22.? + 772 = 977
  23. 23.? + 660 = 826
  24. 24.670 − 285 =
  25. 25.365 − 135 =
  26. 26.123 + 782 =
  27. 27.534 − 203 =
  28. 28.A train has 819 people in the front coaches and 150 people in the back coaches. How many people are on the train?
  29. 29.697 + 278 =
  30. 30.772 − 464 =
  31. 31.779 + 123 =
  32. 32.457 + 465 =
  33. 33.410 + 283 =
  34. 34.606 − 529 =
  35. 35.694 + 129 =
  36. 36.872 + ? = 979
  37. 37.790 − ? = 651
  38. 38.491 + 216 =
  39. 39.A school has 961 children. 786 of them are girls. How many boys are there?
  40. 40.664 + 153 =

Answer key

  1. 499
  2. 767
  3. 530
  4. 513
  5. 189
  6. 924
  7. 111
  8. 985
  9. 310
  10. 944
  11. 480
  12. 193
  13. 845
  14. 894
  15. 138
  16. 474
  17. 3
  18. 947
  19. 793
  20. 112
  21. 198
  22. 205
  23. 166
  24. 385
  25. 230
  26. 905
  27. 331
  28. 969
  29. 975
  30. 308
  31. 902
  32. 922
  33. 693
  34. 77
  35. 823
  36. 107
  37. 139
  38. 707
  39. 175
  40. 817

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