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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 516 · 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. 1.698 + 282 =
  2. 2.565 − ? = 235
  3. 3.? − 336 = 151
  4. 4.? − 100 = 327
  5. 5.603 + 257 =
  6. 6.? − 583 = 341
  7. 7.A train has 895 people in the front coaches and 103 people in the back coaches. How many people are on the train?
  8. 8.709 − 223 =
  9. 9.430 − 153 =
  10. 10.595 − 242 =
  11. 11.343 − ? = 225
  12. 12.A school has 978 children. 766 of them are girls. How many boys are there?
  13. 13.? − 601 = 235
  14. 14.222 − 212 =
  15. 15.393 + ? = 987
  16. 16.A school has 579 children. 440 of them are girls. How many boys are there?
  17. 17.475 − 134 =
  18. 18.156 + 745 =
  19. 19.A school has 458 children. 287 of them are girls. How many boys are there?
  20. 20.A school has 799 children. 231 of them are girls. How many boys are there?
  21. 21.710 − 230 =
  22. 22.710 + ? = 978
  23. 23.404 − ? = 82
  24. 24.A train has 507 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  25. 25.A train has 625 people in the front coaches and 187 people in the back coaches. How many people are on the train?
  26. 26.A school has 601 children. 414 of them are girls. How many boys are there?
  27. 27.A train has 357 people in the front coaches and 234 people in the back coaches. How many people are on the train?
  28. 28.725 + ? = 995
  29. 29.763 + 133 =
  30. 30.250 + 510 =
  31. 31.? − 713 = 268
  32. 32.287 + ? = 413
  33. 33.? + 331 = 962
  34. 34.735 − 356 =
  35. 35.A train has 170 people in the front coaches and 291 people in the back coaches. How many people are on the train?
  36. 36.617 − 552 =
  37. 37.A school has 737 children. 645 of them are girls. How many boys are there?
  38. 38.736 + 244 =
  39. 39.795 − 257 =
  40. 40.409 − ? = 288

Answer key

  1. 980
  2. 330
  3. 487
  4. 427
  5. 860
  6. 924
  7. 998
  8. 486
  9. 277
  10. 353
  11. 118
  12. 212
  13. 836
  14. 10
  15. 594
  16. 139
  17. 341
  18. 901
  19. 171
  20. 568
  21. 480
  22. 268
  23. 322
  24. 607
  25. 812
  26. 187
  27. 591
  28. 270
  29. 896
  30. 760
  31. 981
  32. 126
  33. 631
  34. 379
  35. 461
  36. 65
  37. 92
  38. 980
  39. 538
  40. 121

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