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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 731 · 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 613 children. 582 of them are girls. How many boys are there?
  2. 2.A school has 896 children. 707 of them are girls. How many boys are there?
  3. 3.580 + ? = 762
  4. 4.347 + 379 =
  5. 5.? + 588 = 816
  6. 6.844 + 140 =
  7. 7.A school has 597 children. 571 of them are girls. How many boys are there?
  8. 8.A school has 869 children. 345 of them are girls. How many boys are there?
  9. 9.540 − ? = 42
  10. 10.A train has 234 people in the front coaches and 682 people in the back coaches. How many people are on the train?
  11. 11.? − 323 = 46
  12. 12.554 − 542 =
  13. 13.231 + ? = 619
  14. 14.241 + 441 =
  15. 15.719 − 637 =
  16. 16.? − 310 = 101
  17. 17.? − 227 = 755
  18. 18.810 + 114 =
  19. 19.? − 647 = 350
  20. 20.? + 132 = 341
  21. 21.420 − 272 =
  22. 22.A train has 508 people in the front coaches and 249 people in the back coaches. How many people are on the train?
  23. 23.A train has 725 people in the front coaches and 196 people in the back coaches. How many people are on the train?
  24. 24.A school has 519 children. 157 of them are girls. How many boys are there?
  25. 25.A school has 242 children. 183 of them are girls. How many boys are there?
  26. 26.796 + 157 =
  27. 27.A train has 296 people in the front coaches and 134 people in the back coaches. How many people are on the train?
  28. 28.983 − 490 =
  29. 29.928 − ? = 63
  30. 30.662 + 260 =
  31. 31.241 − 173 =
  32. 32.A school has 696 children. 482 of them are girls. How many boys are there?
  33. 33.? + 312 = 682
  34. 34.581 + ? = 734
  35. 35.? − 290 = 113
  36. 36.A school has 649 children. 105 of them are girls. How many boys are there?
  37. 37.A train has 268 people in the front coaches and 326 people in the back coaches. How many people are on the train?
  38. 38.272 + 220 =
  39. 39.699 − 193 =
  40. 40.357 + 400 =

Answer key

  1. 31
  2. 189
  3. 182
  4. 726
  5. 228
  6. 984
  7. 26
  8. 524
  9. 498
  10. 916
  11. 369
  12. 12
  13. 388
  14. 682
  15. 82
  16. 411
  17. 982
  18. 924
  19. 997
  20. 209
  21. 148
  22. 757
  23. 921
  24. 362
  25. 59
  26. 953
  27. 430
  28. 493
  29. 865
  30. 922
  31. 68
  32. 214
  33. 370
  34. 153
  35. 403
  36. 544
  37. 594
  38. 492
  39. 506
  40. 757

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