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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 825 · 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. 1.468 − ? = 299
  2. 2.862 − 179 =
  3. 3.515 − ? = 303
  4. 4.A school has 706 children. 567 of them are girls. How many boys are there?
  5. 5.407 + ? = 652
  6. 6.295 − 167 =
  7. 7.612 + 108 =
  8. 8.? + 137 = 303
  9. 9.? − 179 = 28
  10. 10.A train has 762 people in the front coaches and 206 people in the back coaches. How many people are on the train?
  11. 11.? + 492 = 820
  12. 12.A train has 401 people in the front coaches and 532 people in the back coaches. How many people are on the train?
  13. 13.? − 236 = 270
  14. 14.130 + 186 =
  15. 15.A school has 728 children. 434 of them are girls. How many boys are there?
  16. 16.A train has 247 people in the front coaches and 204 people in the back coaches. How many people are on the train?
  17. 17.414 − ? = 93
  18. 18.363 − 172 =
  19. 19.849 − ? = 374
  20. 20.A school has 928 children. 630 of them are girls. How many boys are there?
  21. 21.A train has 863 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  22. 22.A train has 158 people in the front coaches and 732 people in the back coaches. How many people are on the train?
  23. 23.371 − 167 =
  24. 24.? + 410 = 613
  25. 25.A train has 896 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  26. 26.? + 114 = 649
  27. 27.A school has 684 children. 394 of them are girls. How many boys are there?
  28. 28.A school has 921 children. 264 of them are girls. How many boys are there?
  29. 29.? − 407 = 504
  30. 30.920 − ? = 567
  31. 31.A school has 953 children. 423 of them are girls. How many boys are there?
  32. 32.A school has 764 children. 318 of them are girls. How many boys are there?
  33. 33.? + 584 = 964
  34. 34.305 − ? = 49
  35. 35.A school has 388 children. 191 of them are girls. How many boys are there?
  36. 36.183 + ? = 458
  37. 37.A school has 812 children. 149 of them are girls. How many boys are there?
  38. 38.873 − 597 =
  39. 39.A train has 584 people in the front coaches and 301 people in the back coaches. How many people are on the train?
  40. 40.135 + 841 =

Answer key

  1. 169
  2. 683
  3. 212
  4. 139
  5. 245
  6. 128
  7. 720
  8. 166
  9. 207
  10. 968
  11. 328
  12. 933
  13. 506
  14. 316
  15. 294
  16. 451
  17. 321
  18. 191
  19. 475
  20. 298
  21. 980
  22. 890
  23. 204
  24. 203
  25. 998
  26. 535
  27. 290
  28. 657
  29. 911
  30. 353
  31. 530
  32. 446
  33. 380
  34. 256
  35. 197
  36. 275
  37. 663
  38. 276
  39. 885
  40. 976

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