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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 501 · 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. 1.357 − ? = 168
  2. 2.A train has 645 people in the front coaches and 119 people in the back coaches. How many people are on the train?
  3. 3.A school has 946 children. 555 of them are girls. How many boys are there?
  4. 4.? + 843 = 956
  5. 5.A school has 269 children. 225 of them are girls. How many boys are there?
  6. 6.396 − 347 =
  7. 7.A train has 224 people in the front coaches and 524 people in the back coaches. How many people are on the train?
  8. 8.A train has 694 people in the front coaches and 171 people in the back coaches. How many people are on the train?
  9. 9.879 − 855 =
  10. 10.153 + 647 =
  11. 11.379 − 252 =
  12. 12.A train has 589 people in the front coaches and 317 people in the back coaches. How many people are on the train?
  13. 13.890 + ? = 993
  14. 14.? + 246 = 377
  15. 15.265 − ? = 29
  16. 16.464 + 479 =
  17. 17.331 + 311 =
  18. 18.485 − 138 =
  19. 19.A train has 424 people in the front coaches and 321 people in the back coaches. How many people are on the train?
  20. 20.514 − 300 =
  21. 21.A train has 387 people in the front coaches and 395 people in the back coaches. How many people are on the train?
  22. 22.A school has 862 children. 542 of them are girls. How many boys are there?
  23. 23.434 + 469 =
  24. 24.A school has 779 children. 181 of them are girls. How many boys are there?
  25. 25.810 + 104 =
  26. 26.599 − 294 =
  27. 27.960 − ? = 12
  28. 28.A school has 373 children. 242 of them are girls. How many boys are there?
  29. 29.834 + 122 =
  30. 30.667 + 168 =
  31. 31.433 + 483 =
  32. 32.? − 346 = 153
  33. 33.? − 122 = 766
  34. 34.? − 172 = 241
  35. 35.A school has 200 children. 150 of them are girls. How many boys are there?
  36. 36.377 − ? = 143
  37. 37.216 − ? = 93
  38. 38.478 − 473 =
  39. 39.579 − 575 =
  40. 40.A school has 288 children. 140 of them are girls. How many boys are there?

Answer key

  1. 189
  2. 764
  3. 391
  4. 113
  5. 44
  6. 49
  7. 748
  8. 865
  9. 24
  10. 800
  11. 127
  12. 906
  13. 103
  14. 131
  15. 236
  16. 943
  17. 642
  18. 347
  19. 745
  20. 214
  21. 782
  22. 320
  23. 903
  24. 598
  25. 914
  26. 305
  27. 948
  28. 131
  29. 956
  30. 835
  31. 916
  32. 499
  33. 888
  34. 413
  35. 50
  36. 234
  37. 123
  38. 5
  39. 4
  40. 148

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