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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 462 · 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. 1.405 + ? = 762
  2. 2.? + 639 = 772
  3. 3.142 + 425 =
  4. 4.A school has 807 children. 780 of them are girls. How many boys are there?
  5. 5.820 − 787 =
  6. 6.913 − 502 =
  7. 7.A school has 210 children. 141 of them are girls. How many boys are there?
  8. 8.309 − 180 =
  9. 9.A school has 685 children. 487 of them are girls. How many boys are there?
  10. 10.962 − 252 =
  11. 11.? + 160 = 701
  12. 12.812 + 122 =
  13. 13.A train has 607 people in the front coaches and 315 people in the back coaches. How many people are on the train?
  14. 14.810 + ? = 986
  15. 15.? + 197 = 758
  16. 16.897 + ? = 998
  17. 17.337 − 241 =
  18. 18.440 + 159 =
  19. 19.A school has 527 children. 209 of them are girls. How many boys are there?
  20. 20.364 + ? = 798
  21. 21.? − 468 = 106
  22. 22.855 + 131 =
  23. 23.A school has 420 children. 337 of them are girls. How many boys are there?
  24. 24.194 + 294 =
  25. 25.452 − ? = 127
  26. 26.A school has 243 children. 172 of them are girls. How many boys are there?
  27. 27.? + 591 = 853
  28. 28.788 + 172 =
  29. 29.A school has 430 children. 370 of them are girls. How many boys are there?
  30. 30.A train has 116 people in the front coaches and 855 people in the back coaches. How many people are on the train?
  31. 31.593 − 479 =
  32. 32.806 − 272 =
  33. 33.A school has 945 children. 766 of them are girls. How many boys are there?
  34. 34.729 + ? = 910
  35. 35.? + 843 = 972
  36. 36.A school has 428 children. 124 of them are girls. How many boys are there?
  37. 37.763 − 303 =
  38. 38.779 − 710 =
  39. 39.? + 203 = 505
  40. 40.? − 595 = 191

Answer key

  1. 357
  2. 133
  3. 567
  4. 27
  5. 33
  6. 411
  7. 69
  8. 129
  9. 198
  10. 710
  11. 541
  12. 934
  13. 922
  14. 176
  15. 561
  16. 101
  17. 96
  18. 599
  19. 318
  20. 434
  21. 574
  22. 986
  23. 83
  24. 488
  25. 325
  26. 71
  27. 262
  28. 960
  29. 60
  30. 971
  31. 114
  32. 534
  33. 179
  34. 181
  35. 129
  36. 304
  37. 460
  38. 69
  39. 302
  40. 786

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