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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 103 · 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 986 children. 634 of them are girls. How many boys are there?
  2. 2.? + 608 = 895
  3. 3.943 − 604 =
  4. 4.A train has 306 people in the front coaches and 222 people in the back coaches. How many people are on the train?
  5. 5.614 + 294 =
  6. 6.A school has 902 children. 266 of them are girls. How many boys are there?
  7. 7.381 + 618 =
  8. 8.771 + ? = 953
  9. 9.A train has 231 people in the front coaches and 286 people in the back coaches. How many people are on the train?
  10. 10.882 + ? = 993
  11. 11.? + 627 = 751
  12. 12.558 + 187 =
  13. 13.? + 317 = 676
  14. 14.329 − 244 =
  15. 15.432 + ? = 640
  16. 16.A train has 794 people in the front coaches and 180 people in the back coaches. How many people are on the train?
  17. 17.442 + 387 =
  18. 18.370 − ? = 155
  19. 19.A train has 244 people in the front coaches and 521 people in the back coaches. How many people are on the train?
  20. 20.? − 429 = 135
  21. 21.752 + 200 =
  22. 22.407 − 312 =
  23. 23.? + 701 = 815
  24. 24.166 + 777 =
  25. 25.840 − ? = 139
  26. 26.688 − 153 =
  27. 27.A school has 312 children. 276 of them are girls. How many boys are there?
  28. 28.216 − ? = 11
  29. 29.? − 189 = 31
  30. 30.329 − 106 =
  31. 31.550 + 203 =
  32. 32.A school has 406 children. 317 of them are girls. How many boys are there?
  33. 33.794 + 142 =
  34. 34.? + 782 = 942
  35. 35.386 + 322 =
  36. 36.854 + 131 =
  37. 37.A train has 321 people in the front coaches and 380 people in the back coaches. How many people are on the train?
  38. 38.A school has 431 children. 339 of them are girls. How many boys are there?
  39. 39.? − 121 = 404
  40. 40.A school has 362 children. 226 of them are girls. How many boys are there?

Answer key

  1. 352
  2. 287
  3. 339
  4. 528
  5. 908
  6. 636
  7. 999
  8. 182
  9. 517
  10. 111
  11. 124
  12. 745
  13. 359
  14. 85
  15. 208
  16. 974
  17. 829
  18. 215
  19. 765
  20. 564
  21. 952
  22. 95
  23. 114
  24. 943
  25. 701
  26. 535
  27. 36
  28. 205
  29. 220
  30. 223
  31. 753
  32. 89
  33. 936
  34. 160
  35. 708
  36. 985
  37. 701
  38. 92
  39. 525
  40. 136

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