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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 43 · 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. 1.854 − ? = 664
  2. 2.739 + ? = 850
  3. 3.930 − ? = 153
  4. 4.A train has 577 people in the front coaches and 317 people in the back coaches. How many people are on the train?
  5. 5.? − 208 = 641
  6. 6.A train has 393 people in the front coaches and 470 people in the back coaches. How many people are on the train?
  7. 7.? + 864 = 975
  8. 8.639 + ? = 739
  9. 9.? − 174 = 175
  10. 10.259 − 211 =
  11. 11.A school has 929 children. 601 of them are girls. How many boys are there?
  12. 12.961 − 714 =
  13. 13.588 + ? = 891
  14. 14.424 − 342 =
  15. 15.523 − 170 =
  16. 16.476 + ? = 969
  17. 17.898 + 101 =
  18. 18.? + 768 = 945
  19. 19.A school has 343 children. 273 of them are girls. How many boys are there?
  20. 20.577 + 348 =
  21. 21.? + 704 = 824
  22. 22.? − 605 = 136
  23. 23.A train has 522 people in the front coaches and 432 people in the back coaches. How many people are on the train?
  24. 24.972 − 612 =
  25. 25.616 + 109 =
  26. 26.438 − 134 =
  27. 27.A train has 653 people in the front coaches and 201 people in the back coaches. How many people are on the train?
  28. 28.296 − ? = 82
  29. 29.A school has 749 children. 129 of them are girls. How many boys are there?
  30. 30.A school has 216 children. 138 of them are girls. How many boys are there?
  31. 31.279 + ? = 669
  32. 32.592 + ? = 892
  33. 33.798 + 175 =
  34. 34.A school has 446 children. 222 of them are girls. How many boys are there?
  35. 35.A train has 168 people in the front coaches and 342 people in the back coaches. How many people are on the train?
  36. 36.? − 141 = 331
  37. 37.553 − ? = 45
  38. 38.A school has 343 children. 271 of them are girls. How many boys are there?
  39. 39.244 − 133 =
  40. 40.232 + 158 =

Answer key

  1. 190
  2. 111
  3. 777
  4. 894
  5. 849
  6. 863
  7. 111
  8. 100
  9. 349
  10. 48
  11. 328
  12. 247
  13. 303
  14. 82
  15. 353
  16. 493
  17. 999
  18. 177
  19. 70
  20. 925
  21. 120
  22. 741
  23. 954
  24. 360
  25. 725
  26. 304
  27. 854
  28. 214
  29. 620
  30. 78
  31. 390
  32. 300
  33. 973
  34. 224
  35. 510
  36. 472
  37. 508
  38. 72
  39. 111
  40. 390

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