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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 770 · 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 277 children. 268 of them are girls. How many boys are there?
  2. 2.344 − 123 =
  3. 3.A school has 761 children. 688 of them are girls. How many boys are there?
  4. 4.? + 512 = 901
  5. 5.A school has 986 children. 661 of them are girls. How many boys are there?
  6. 6.791 + 105 =
  7. 7.936 − ? = 563
  8. 8.294 + 160 =
  9. 9.289 + 119 =
  10. 10.? − 572 = 165
  11. 11.636 − 603 =
  12. 12.? − 758 = 103
  13. 13.A train has 136 people in the front coaches and 210 people in the back coaches. How many people are on the train?
  14. 14.965 − 298 =
  15. 15.257 + ? = 853
  16. 16.? − 327 = 244
  17. 17.A train has 748 people in the front coaches and 156 people in the back coaches. How many people are on the train?
  18. 18.626 + 221 =
  19. 19.415 − ? = 112
  20. 20.847 + 152 =
  21. 21.875 − 177 =
  22. 22.? + 369 = 922
  23. 23.352 + 352 =
  24. 24.A school has 611 children. 258 of them are girls. How many boys are there?
  25. 25.A train has 825 people in the front coaches and 152 people in the back coaches. How many people are on the train?
  26. 26.A train has 702 people in the front coaches and 297 people in the back coaches. How many people are on the train?
  27. 27.366 + 159 =
  28. 28.785 − 549 =
  29. 29.379 − ? = 131
  30. 30.668 + 194 =
  31. 31.789 + 197 =
  32. 32.A train has 422 people in the front coaches and 296 people in the back coaches. How many people are on the train?
  33. 33.? + 277 = 998
  34. 34.102 + ? = 356
  35. 35.848 − 505 =
  36. 36.757 − 141 =
  37. 37.711 − 477 =
  38. 38.A school has 952 children. 338 of them are girls. How many boys are there?
  39. 39.A school has 274 children. 256 of them are girls. How many boys are there?
  40. 40.? − 118 = 307

Answer key

  1. 9
  2. 221
  3. 73
  4. 389
  5. 325
  6. 896
  7. 373
  8. 454
  9. 408
  10. 737
  11. 33
  12. 861
  13. 346
  14. 667
  15. 596
  16. 571
  17. 904
  18. 847
  19. 303
  20. 999
  21. 698
  22. 553
  23. 704
  24. 353
  25. 977
  26. 999
  27. 525
  28. 236
  29. 248
  30. 862
  31. 986
  32. 718
  33. 721
  34. 254
  35. 343
  36. 616
  37. 234
  38. 614
  39. 18
  40. 425

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