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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 193 · 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. 1.165 + 184 =
  2. 2.? + 482 = 598
  3. 3.607 − 194 =
  4. 4.204 − 126 =
  5. 5.615 − ? = 397
  6. 6.? − 415 = 228
  7. 7.A train has 793 people in the front coaches and 152 people in the back coaches. How many people are on the train?
  8. 8.? + 775 = 904
  9. 9.331 − ? = 151
  10. 10.? + 138 = 863
  11. 11.225 − 107 =
  12. 12.A train has 115 people in the front coaches and 552 people in the back coaches. How many people are on the train?
  13. 13.772 + 193 =
  14. 14.? + 612 = 891
  15. 15.A train has 856 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  16. 16.A train has 537 people in the front coaches and 360 people in the back coaches. How many people are on the train?
  17. 17.A school has 418 children. 236 of them are girls. How many boys are there?
  18. 18.786 − 229 =
  19. 19.693 − ? = 433
  20. 20.553 − ? = 184
  21. 21.572 + 205 =
  22. 22.A train has 244 people in the front coaches and 139 people in the back coaches. How many people are on the train?
  23. 23.A school has 690 children. 343 of them are girls. How many boys are there?
  24. 24.587 + ? = 993
  25. 25.676 − 662 =
  26. 26.? + 322 = 513
  27. 27.527 − 107 =
  28. 28.628 − 612 =
  29. 29.A train has 326 people in the front coaches and 360 people in the back coaches. How many people are on the train?
  30. 30.A school has 839 children. 395 of them are girls. How many boys are there?
  31. 31.427 − 216 =
  32. 32.274 − 134 =
  33. 33.? + 839 = 988
  34. 34.644 − ? = 266
  35. 35.A train has 662 people in the front coaches and 316 people in the back coaches. How many people are on the train?
  36. 36.A school has 625 children. 484 of them are girls. How many boys are there?
  37. 37.A train has 881 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  38. 38.201 + ? = 442
  39. 39.689 + 239 =
  40. 40.786 − 183 =

Answer key

  1. 349
  2. 116
  3. 413
  4. 78
  5. 218
  6. 643
  7. 945
  8. 129
  9. 180
  10. 725
  11. 118
  12. 667
  13. 965
  14. 279
  15. 957
  16. 897
  17. 182
  18. 557
  19. 260
  20. 369
  21. 777
  22. 383
  23. 347
  24. 406
  25. 14
  26. 191
  27. 420
  28. 16
  29. 686
  30. 444
  31. 211
  32. 140
  33. 149
  34. 378
  35. 978
  36. 141
  37. 989
  38. 241
  39. 928
  40. 603

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