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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 809 · 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. 1.683 + ? = 805
  2. 2.461 + 112 =
  3. 3.771 − 544 =
  4. 4.497 − 149 =
  5. 5.A school has 949 children. 880 of them are girls. How many boys are there?
  6. 6.A train has 476 people in the front coaches and 246 people in the back coaches. How many people are on the train?
  7. 7.829 − 403 =
  8. 8.835 − 218 =
  9. 9.145 + 556 =
  10. 10.586 − ? = 335
  11. 11.? + 746 = 952
  12. 12.706 − ? = 222
  13. 13.A train has 192 people in the front coaches and 791 people in the back coaches. How many people are on the train?
  14. 14.301 − 200 =
  15. 15.? + 242 = 874
  16. 16.853 + ? = 979
  17. 17.A train has 794 people in the front coaches and 190 people in the back coaches. How many people are on the train?
  18. 18.751 − 478 =
  19. 19.292 − 153 =
  20. 20.? + 391 = 542
  21. 21.A train has 493 people in the front coaches and 424 people in the back coaches. How many people are on the train?
  22. 22.A school has 975 children. 653 of them are girls. How many boys are there?
  23. 23.A train has 362 people in the front coaches and 270 people in the back coaches. How many people are on the train?
  24. 24.603 − 367 =
  25. 25.843 − 298 =
  26. 26.206 + ? = 478
  27. 27.A school has 573 children. 467 of them are girls. How many boys are there?
  28. 28.A school has 637 children. 209 of them are girls. How many boys are there?
  29. 29.A school has 694 children. 665 of them are girls. How many boys are there?
  30. 30.A school has 948 children. 689 of them are girls. How many boys are there?
  31. 31.742 − ? = 343
  32. 32.? − 146 = 471
  33. 33.755 + 233 =
  34. 34.798 + ? = 978
  35. 35.A train has 286 people in the front coaches and 563 people in the back coaches. How many people are on the train?
  36. 36.A school has 739 children. 548 of them are girls. How many boys are there?
  37. 37.548 + 344 =
  38. 38.966 − 210 =
  39. 39.733 − 103 =
  40. 40.748 − 201 =

Answer key

  1. 122
  2. 573
  3. 227
  4. 348
  5. 69
  6. 722
  7. 426
  8. 617
  9. 701
  10. 251
  11. 206
  12. 484
  13. 983
  14. 101
  15. 632
  16. 126
  17. 984
  18. 273
  19. 139
  20. 151
  21. 917
  22. 322
  23. 632
  24. 236
  25. 545
  26. 272
  27. 106
  28. 428
  29. 29
  30. 259
  31. 399
  32. 617
  33. 988
  34. 180
  35. 849
  36. 191
  37. 892
  38. 756
  39. 630
  40. 547

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