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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 153 · 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. 1.895 − ? = 467
  2. 2.759 − ? = 155
  3. 3.635 − 461 =
  4. 4.A train has 251 people in the front coaches and 515 people in the back coaches. How many people are on the train?
  5. 5.A school has 315 children. 219 of them are girls. How many boys are there?
  6. 6.A school has 846 children. 515 of them are girls. How many boys are there?
  7. 7.170 + ? = 919
  8. 8.? − 444 = 160
  9. 9.247 − 165 =
  10. 10.A school has 683 children. 471 of them are girls. How many boys are there?
  11. 11.A school has 347 children. 144 of them are girls. How many boys are there?
  12. 12.224 − 124 =
  13. 13.698 − ? = 439
  14. 14.334 + 216 =
  15. 15.716 + ? = 983
  16. 16.818 + 123 =
  17. 17.567 + 395 =
  18. 18.A school has 458 children. 137 of them are girls. How many boys are there?
  19. 19.219 + ? = 971
  20. 20.A train has 170 people in the front coaches and 400 people in the back coaches. How many people are on the train?
  21. 21.432 − ? = 165
  22. 22.415 + 183 =
  23. 23.A school has 653 children. 621 of them are girls. How many boys are there?
  24. 24.A train has 260 people in the front coaches and 271 people in the back coaches. How many people are on the train?
  25. 25.206 − 110 =
  26. 26.365 + ? = 614
  27. 27.605 + ? = 795
  28. 28.? − 190 = 161
  29. 29.363 − ? = 252
  30. 30.A school has 629 children. 197 of them are girls. How many boys are there?
  31. 31.? − 118 = 275
  32. 32.894 + 103 =
  33. 33.? + 281 = 687
  34. 34.A train has 515 people in the front coaches and 280 people in the back coaches. How many people are on the train?
  35. 35.? − 255 = 56
  36. 36.201 + 532 =
  37. 37.775 + ? = 876
  38. 38.269 + ? = 847
  39. 39.A school has 211 children. 172 of them are girls. How many boys are there?
  40. 40.? + 577 = 749

Answer key

  1. 428
  2. 604
  3. 174
  4. 766
  5. 96
  6. 331
  7. 749
  8. 604
  9. 82
  10. 212
  11. 203
  12. 100
  13. 259
  14. 550
  15. 267
  16. 941
  17. 962
  18. 321
  19. 752
  20. 570
  21. 267
  22. 598
  23. 32
  24. 531
  25. 96
  26. 249
  27. 190
  28. 351
  29. 111
  30. 432
  31. 393
  32. 997
  33. 406
  34. 795
  35. 311
  36. 733
  37. 101
  38. 578
  39. 39
  40. 172

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