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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 749 · 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. 1.626 − 305 =
  2. 2.A school has 660 children. 169 of them are girls. How many boys are there?
  3. 3.970 − 683 =
  4. 4.241 − 230 =
  5. 5.A train has 431 people in the front coaches and 478 people in the back coaches. How many people are on the train?
  6. 6.? + 452 = 849
  7. 7.? + 319 = 474
  8. 8.228 − 225 =
  9. 9.A school has 302 children. 101 of them are girls. How many boys are there?
  10. 10.323 + ? = 974
  11. 11.652 − 542 =
  12. 12.A school has 332 children. 301 of them are girls. How many boys are there?
  13. 13.A school has 380 children. 153 of them are girls. How many boys are there?
  14. 14.940 − ? = 283
  15. 15.A train has 554 people in the front coaches and 385 people in the back coaches. How many people are on the train?
  16. 16.693 + 306 =
  17. 17.? + 823 = 976
  18. 18.806 + ? = 926
  19. 19.? − 710 = 99
  20. 20.749 − ? = 484
  21. 21.889 − 450 =
  22. 22.467 + ? = 652
  23. 23.197 + 227 =
  24. 24.? − 151 = 389
  25. 25.A school has 485 children. 222 of them are girls. How many boys are there?
  26. 26.754 + ? = 875
  27. 27.704 − ? = 477
  28. 28.232 + 761 =
  29. 29.A train has 807 people in the front coaches and 160 people in the back coaches. How many people are on the train?
  30. 30.A train has 434 people in the front coaches and 188 people in the back coaches. How many people are on the train?
  31. 31.A train has 761 people in the front coaches and 159 people in the back coaches. How many people are on the train?
  32. 32.A train has 268 people in the front coaches and 279 people in the back coaches. How many people are on the train?
  33. 33.831 − 250 =
  34. 34.? − 146 = 219
  35. 35.693 − ? = 476
  36. 36.A train has 207 people in the front coaches and 635 people in the back coaches. How many people are on the train?
  37. 37.260 − 135 =
  38. 38.637 − 585 =
  39. 39.? − 294 = 665
  40. 40.647 − ? = 266

Answer key

  1. 321
  2. 491
  3. 287
  4. 11
  5. 909
  6. 397
  7. 155
  8. 3
  9. 201
  10. 651
  11. 110
  12. 31
  13. 227
  14. 657
  15. 939
  16. 999
  17. 153
  18. 120
  19. 809
  20. 265
  21. 439
  22. 185
  23. 424
  24. 540
  25. 263
  26. 121
  27. 227
  28. 993
  29. 967
  30. 622
  31. 920
  32. 547
  33. 581
  34. 365
  35. 217
  36. 842
  37. 125
  38. 52
  39. 959
  40. 381

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