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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 780 · 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 818 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  2. 2.926 − ? = 614
  3. 3.162 + 694 =
  4. 4.? − 158 = 759
  5. 5.A train has 209 people in the front coaches and 790 people in the back coaches. How many people are on the train?
  6. 6.885 + ? = 988
  7. 7.A school has 412 children. 166 of them are girls. How many boys are there?
  8. 8.? + 200 = 787
  9. 9.? + 693 = 899
  10. 10.A train has 808 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  11. 11.? + 677 = 974
  12. 12.639 + 190 =
  13. 13.A train has 183 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  14. 14.A school has 275 children. 241 of them are girls. How many boys are there?
  15. 15.158 + 297 =
  16. 16.405 − 198 =
  17. 17.837 + 159 =
  18. 18.? + 218 = 489
  19. 19.391 − 294 =
  20. 20.A school has 394 children. 229 of them are girls. How many boys are there?
  21. 21.A school has 365 children. 116 of them are girls. How many boys are there?
  22. 22.? + 491 = 742
  23. 23.A train has 355 people in the front coaches and 204 people in the back coaches. How many people are on the train?
  24. 24.340 + 657 =
  25. 25.? + 148 = 806
  26. 26.A school has 740 children. 199 of them are girls. How many boys are there?
  27. 27.537 + ? = 813
  28. 28.887 − 282 =
  29. 29.317 − 279 =
  30. 30.? + 223 = 621
  31. 31.756 + ? = 948
  32. 32.576 + 422 =
  33. 33.A school has 831 children. 304 of them are girls. How many boys are there?
  34. 34.341 − 295 =
  35. 35.750 − ? = 23
  36. 36.676 + 223 =
  37. 37.755 − 745 =
  38. 38.528 − 485 =
  39. 39.A train has 880 people in the front coaches and 103 people in the back coaches. How many people are on the train?
  40. 40.? + 820 = 938

Answer key

  1. 935
  2. 312
  3. 856
  4. 917
  5. 999
  6. 103
  7. 246
  8. 587
  9. 206
  10. 913
  11. 297
  12. 829
  13. 289
  14. 34
  15. 455
  16. 207
  17. 996
  18. 271
  19. 97
  20. 165
  21. 249
  22. 251
  23. 559
  24. 997
  25. 658
  26. 541
  27. 276
  28. 605
  29. 38
  30. 398
  31. 192
  32. 998
  33. 527
  34. 46
  35. 727
  36. 899
  37. 10
  38. 43
  39. 983
  40. 118

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