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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 681 · 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.? − 183 = 532
  2. 2.? + 721 = 935
  3. 3.? + 402 = 690
  4. 4.A school has 724 children. 220 of them are girls. How many boys are there?
  5. 5.A school has 408 children. 227 of them are girls. How many boys are there?
  6. 6.A train has 657 people in the front coaches and 284 people in the back coaches. How many people are on the train?
  7. 7.815 + 169 =
  8. 8.933 − 453 =
  9. 9.751 + ? = 908
  10. 10.610 + ? = 953
  11. 11.A train has 616 people in the front coaches and 233 people in the back coaches. How many people are on the train?
  12. 12.A school has 966 children. 372 of them are girls. How many boys are there?
  13. 13.809 − ? = 288
  14. 14.A school has 785 children. 751 of them are girls. How many boys are there?
  15. 15.679 − ? = 112
  16. 16.758 + 168 =
  17. 17.752 − ? = 217
  18. 18.860 − ? = 652
  19. 19.664 − 311 =
  20. 20.A school has 558 children. 189 of them are girls. How many boys are there?
  21. 21.A train has 503 people in the front coaches and 208 people in the back coaches. How many people are on the train?
  22. 22.A train has 204 people in the front coaches and 591 people in the back coaches. How many people are on the train?
  23. 23.601 + 102 =
  24. 24.? + 483 = 679
  25. 25.542 − ? = 29
  26. 26.? − 456 = 50
  27. 27.759 + 125 =
  28. 28.721 + 231 =
  29. 29.752 + 241 =
  30. 30.A school has 663 children. 385 of them are girls. How many boys are there?
  31. 31.653 − 304 =
  32. 32.A school has 985 children. 317 of them are girls. How many boys are there?
  33. 33.231 + 246 =
  34. 34.590 − 267 =
  35. 35.A school has 733 children. 653 of them are girls. How many boys are there?
  36. 36.711 + ? = 965
  37. 37.768 − ? = 648
  38. 38.332 − ? = 68
  39. 39.? + 477 = 605
  40. 40.119 + 237 =

Answer key

  1. 715
  2. 214
  3. 288
  4. 504
  5. 181
  6. 941
  7. 984
  8. 480
  9. 157
  10. 343
  11. 849
  12. 594
  13. 521
  14. 34
  15. 567
  16. 926
  17. 535
  18. 208
  19. 353
  20. 369
  21. 711
  22. 795
  23. 703
  24. 196
  25. 513
  26. 506
  27. 884
  28. 952
  29. 993
  30. 278
  31. 349
  32. 668
  33. 477
  34. 323
  35. 80
  36. 254
  37. 120
  38. 264
  39. 128
  40. 356

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