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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 802 · 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. 1.286 − 148 =
  2. 2.? − 150 = 387
  3. 3.? − 311 = 121
  4. 4.A train has 791 people in the front coaches and 103 people in the back coaches. How many people are on the train?
  5. 5.A school has 440 children. 164 of them are girls. How many boys are there?
  6. 6.477 − ? = 367
  7. 7.710 + ? = 981
  8. 8.880 − 154 =
  9. 9.366 − 325 =
  10. 10.174 + 137 =
  11. 11.271 − ? = 33
  12. 12.361 + 424 =
  13. 13.215 − ? = 17
  14. 14.304 + 419 =
  15. 15.533 + 196 =
  16. 16.A school has 447 children. 246 of them are girls. How many boys are there?
  17. 17.A school has 656 children. 257 of them are girls. How many boys are there?
  18. 18.? − 138 = 376
  19. 19.A train has 170 people in the front coaches and 246 people in the back coaches. How many people are on the train?
  20. 20.A school has 383 children. 113 of them are girls. How many boys are there?
  21. 21.A train has 345 people in the front coaches and 597 people in the back coaches. How many people are on the train?
  22. 22.A school has 306 children. 149 of them are girls. How many boys are there?
  23. 23.633 − ? = 123
  24. 24.740 + ? = 891
  25. 25.625 − 321 =
  26. 26.756 + 188 =
  27. 27.403 + 280 =
  28. 28.? − 466 = 519
  29. 29.508 − 353 =
  30. 30.558 − 356 =
  31. 31.A school has 651 children. 380 of them are girls. How many boys are there?
  32. 32.357 + ? = 724
  33. 33.A train has 815 people in the front coaches and 148 people in the back coaches. How many people are on the train?
  34. 34.749 + ? = 961
  35. 35.A school has 202 children. 169 of them are girls. How many boys are there?
  36. 36.A train has 155 people in the front coaches and 116 people in the back coaches. How many people are on the train?
  37. 37.858 + ? = 980
  38. 38.? + 166 = 455
  39. 39.A school has 943 children. 288 of them are girls. How many boys are there?
  40. 40.A school has 676 children. 472 of them are girls. How many boys are there?

Answer key

  1. 138
  2. 537
  3. 432
  4. 894
  5. 276
  6. 110
  7. 271
  8. 726
  9. 41
  10. 311
  11. 238
  12. 785
  13. 198
  14. 723
  15. 729
  16. 201
  17. 399
  18. 514
  19. 416
  20. 270
  21. 942
  22. 157
  23. 510
  24. 151
  25. 304
  26. 944
  27. 683
  28. 985
  29. 155
  30. 202
  31. 271
  32. 367
  33. 963
  34. 212
  35. 33
  36. 271
  37. 122
  38. 289
  39. 655
  40. 204

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