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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 93 · 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 327 children. 224 of them are girls. How many boys are there?
  2. 2.A school has 707 children. 222 of them are girls. How many boys are there?
  3. 3.A school has 808 children. 269 of them are girls. How many boys are there?
  4. 4.802 + 196 =
  5. 5.A school has 244 children. 193 of them are girls. How many boys are there?
  6. 6.A train has 264 people in the front coaches and 403 people in the back coaches. How many people are on the train?
  7. 7.A train has 629 people in the front coaches and 297 people in the back coaches. How many people are on the train?
  8. 8.A school has 407 children. 135 of them are girls. How many boys are there?
  9. 9.? + 264 = 417
  10. 10.562 + 340 =
  11. 11.? + 831 = 969
  12. 12.? − 192 = 223
  13. 13.822 + 106 =
  14. 14.? − 186 = 29
  15. 15.564 − ? = 86
  16. 16.A train has 210 people in the front coaches and 392 people in the back coaches. How many people are on the train?
  17. 17.266 + 413 =
  18. 18.? + 415 = 752
  19. 19.? − 252 = 450
  20. 20.885 + ? = 985
  21. 21.832 − 670 =
  22. 22.171 + ? = 425
  23. 23.A school has 955 children. 766 of them are girls. How many boys are there?
  24. 24.344 − 161 =
  25. 25.898 − 801 =
  26. 26.620 − 267 =
  27. 27.? + 102 = 429
  28. 28.? − 158 = 63
  29. 29.? + 797 = 973
  30. 30.883 − ? = 517
  31. 31.557 + 440 =
  32. 32.195 + 260 =
  33. 33.A train has 704 people in the front coaches and 288 people in the back coaches. How many people are on the train?
  34. 34.274 − 247 =
  35. 35.903 − 226 =
  36. 36.444 + 179 =
  37. 37.641 + 149 =
  38. 38.A school has 579 children. 116 of them are girls. How many boys are there?
  39. 39.A train has 795 people in the front coaches and 158 people in the back coaches. How many people are on the train?
  40. 40.331 − 110 =

Answer key

  1. 103
  2. 485
  3. 539
  4. 998
  5. 51
  6. 667
  7. 926
  8. 272
  9. 153
  10. 902
  11. 138
  12. 415
  13. 928
  14. 215
  15. 478
  16. 602
  17. 679
  18. 337
  19. 702
  20. 100
  21. 162
  22. 254
  23. 189
  24. 183
  25. 97
  26. 353
  27. 327
  28. 221
  29. 176
  30. 366
  31. 997
  32. 455
  33. 992
  34. 27
  35. 677
  36. 623
  37. 790
  38. 463
  39. 953
  40. 221

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