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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 766 · 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 273 children. 203 of them are girls. How many boys are there?
  2. 2.A train has 596 people in the front coaches and 326 people in the back coaches. How many people are on the train?
  3. 3.746 − ? = 324
  4. 4.373 + 272 =
  5. 5.599 − ? = 339
  6. 6.A school has 892 children. 593 of them are girls. How many boys are there?
  7. 7.867 + 118 =
  8. 8.A train has 240 people in the front coaches and 675 people in the back coaches. How many people are on the train?
  9. 9.424 − 416 =
  10. 10.946 − ? = 172
  11. 11.A school has 880 children. 750 of them are girls. How many boys are there?
  12. 12.653 − ? = 119
  13. 13.181 + ? = 289
  14. 14.A train has 869 people in the front coaches and 113 people in the back coaches. How many people are on the train?
  15. 15.? − 188 = 192
  16. 16.991 − 847 =
  17. 17.? + 338 = 707
  18. 18.840 + ? = 993
  19. 19.? + 438 = 691
  20. 20.A school has 806 children. 294 of them are girls. How many boys are there?
  21. 21.388 − ? = 69
  22. 22.? + 832 = 950
  23. 23.492 − 167 =
  24. 24.203 − 163 =
  25. 25.237 − 153 =
  26. 26.207 − 196 =
  27. 27.A train has 716 people in the front coaches and 248 people in the back coaches. How many people are on the train?
  28. 28.521 − 517 =
  29. 29.368 − 143 =
  30. 30.426 − 183 =
  31. 31.229 − 180 =
  32. 32.733 + 174 =
  33. 33.768 − 312 =
  34. 34.319 + 122 =
  35. 35.A train has 554 people in the front coaches and 420 people in the back coaches. How many people are on the train?
  36. 36.? + 139 = 894
  37. 37.536 + ? = 664
  38. 38.A train has 812 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  39. 39.? + 225 = 331
  40. 40.? − 213 = 561

Answer key

  1. 70
  2. 922
  3. 422
  4. 645
  5. 260
  6. 299
  7. 985
  8. 915
  9. 8
  10. 774
  11. 130
  12. 534
  13. 108
  14. 982
  15. 380
  16. 144
  17. 369
  18. 153
  19. 253
  20. 512
  21. 319
  22. 118
  23. 325
  24. 40
  25. 84
  26. 11
  27. 964
  28. 4
  29. 225
  30. 243
  31. 49
  32. 907
  33. 456
  34. 441
  35. 974
  36. 755
  37. 128
  38. 933
  39. 106
  40. 774

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