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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 371 · 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. 1.218 − 168 =
  2. 2.404 + 448 =
  3. 3.374 + ? = 536
  4. 4.? − 307 = 417
  5. 5.601 − 568 =
  6. 6.? + 679 = 833
  7. 7.? + 771 = 997
  8. 8.244 − 135 =
  9. 9.A school has 377 children. 318 of them are girls. How many boys are there?
  10. 10.226 − 173 =
  11. 11.A train has 588 people in the front coaches and 280 people in the back coaches. How many people are on the train?
  12. 12.537 + 189 =
  13. 13.665 − 444 =
  14. 14.397 − 122 =
  15. 15.? − 615 = 198
  16. 16.? + 859 = 984
  17. 17.? − 157 = 93
  18. 18.A train has 503 people in the front coaches and 471 people in the back coaches. How many people are on the train?
  19. 19.A train has 804 people in the front coaches and 120 people in the back coaches. How many people are on the train?
  20. 20.A school has 907 children. 392 of them are girls. How many boys are there?
  21. 21.A train has 746 people in the front coaches and 118 people in the back coaches. How many people are on the train?
  22. 22.A train has 731 people in the front coaches and 209 people in the back coaches. How many people are on the train?
  23. 23.? − 609 = 317
  24. 24.604 + 367 =
  25. 25.232 − 179 =
  26. 26.214 − ? = 17
  27. 27.A train has 180 people in the front coaches and 109 people in the back coaches. How many people are on the train?
  28. 28.442 + ? = 713
  29. 29.515 + 428 =
  30. 30.? + 491 = 982
  31. 31.236 − 212 =
  32. 32.521 + 195 =
  33. 33.? − 127 = 237
  34. 34.A train has 714 people in the front coaches and 251 people in the back coaches. How many people are on the train?
  35. 35.208 + ? = 439
  36. 36.A school has 409 children. 103 of them are girls. How many boys are there?
  37. 37.780 + ? = 946
  38. 38.A train has 273 people in the front coaches and 344 people in the back coaches. How many people are on the train?
  39. 39.A school has 958 children. 627 of them are girls. How many boys are there?
  40. 40.? − 555 = 69

Answer key

  1. 50
  2. 852
  3. 162
  4. 724
  5. 33
  6. 154
  7. 226
  8. 109
  9. 59
  10. 53
  11. 868
  12. 726
  13. 221
  14. 275
  15. 813
  16. 125
  17. 250
  18. 974
  19. 924
  20. 515
  21. 864
  22. 940
  23. 926
  24. 971
  25. 53
  26. 197
  27. 289
  28. 271
  29. 943
  30. 491
  31. 24
  32. 716
  33. 364
  34. 965
  35. 231
  36. 306
  37. 166
  38. 617
  39. 331
  40. 624

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