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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 693 · 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.A train has 678 people in the front coaches and 240 people in the back coaches. How many people are on the train?
  2. 2.? + 740 = 944
  3. 3.A school has 223 children. 163 of them are girls. How many boys are there?
  4. 4.? + 163 = 519
  5. 5.A school has 953 children. 104 of them are girls. How many boys are there?
  6. 6.548 + ? = 810
  7. 7.668 − 379 =
  8. 8.752 + 175 =
  9. 9.A school has 853 children. 632 of them are girls. How many boys are there?
  10. 10.A train has 866 people in the front coaches and 124 people in the back coaches. How many people are on the train?
  11. 11.A school has 468 children. 307 of them are girls. How many boys are there?
  12. 12.? + 345 = 502
  13. 13.311 + 670 =
  14. 14.? + 496 = 771
  15. 15.909 − 806 =
  16. 16.671 − ? = 465
  17. 17.568 + 197 =
  18. 18.? + 809 = 990
  19. 19.797 + ? = 920
  20. 20.886 + 101 =
  21. 21.? + 139 = 345
  22. 22.? + 804 = 924
  23. 23.695 − 175 =
  24. 24.A train has 876 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  25. 25.A train has 654 people in the front coaches and 271 people in the back coaches. How many people are on the train?
  26. 26.732 + ? = 906
  27. 27.A train has 165 people in the front coaches and 309 people in the back coaches. How many people are on the train?
  28. 28.414 − 226 =
  29. 29.A train has 720 people in the front coaches and 248 people in the back coaches. How many people are on the train?
  30. 30.A train has 464 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  31. 31.575 − 336 =
  32. 32.503 + 151 =
  33. 33.432 − 398 =
  34. 34.? − 218 = 195
  35. 35.A school has 727 children. 657 of them are girls. How many boys are there?
  36. 36.A school has 433 children. 249 of them are girls. How many boys are there?
  37. 37.732 + 112 =
  38. 38.A school has 231 children. 225 of them are girls. How many boys are there?
  39. 39.A train has 454 people in the front coaches and 299 people in the back coaches. How many people are on the train?
  40. 40.717 + 254 =

Answer key

  1. 918
  2. 204
  3. 60
  4. 356
  5. 849
  6. 262
  7. 289
  8. 927
  9. 221
  10. 990
  11. 161
  12. 157
  13. 981
  14. 275
  15. 103
  16. 206
  17. 765
  18. 181
  19. 123
  20. 987
  21. 206
  22. 120
  23. 520
  24. 980
  25. 925
  26. 174
  27. 474
  28. 188
  29. 968
  30. 568
  31. 239
  32. 654
  33. 34
  34. 413
  35. 70
  36. 184
  37. 844
  38. 6
  39. 753
  40. 971

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