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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 192 · 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. 1.569 − 361 =
  2. 2.424 + 575 =
  3. 3.? − 128 = 524
  4. 4.300 − 230 =
  5. 5.? + 801 = 903
  6. 6.209 − 173 =
  7. 7.? + 759 = 956
  8. 8.586 − 482 =
  9. 9.590 − 135 =
  10. 10.754 − 745 =
  11. 11.142 + 491 =
  12. 12.A school has 593 children. 317 of them are girls. How many boys are there?
  13. 13.325 − 105 =
  14. 14.A school has 341 children. 319 of them are girls. How many boys are there?
  15. 15.A train has 543 people in the front coaches and 335 people in the back coaches. How many people are on the train?
  16. 16.741 + ? = 938
  17. 17.A school has 267 children. 189 of them are girls. How many boys are there?
  18. 18.241 + 487 =
  19. 19.739 − ? = 268
  20. 20.A train has 527 people in the front coaches and 193 people in the back coaches. How many people are on the train?
  21. 21.A train has 397 people in the front coaches and 386 people in the back coaches. How many people are on the train?
  22. 22.? + 261 = 569
  23. 23.551 − ? = 351
  24. 24.A school has 827 children. 242 of them are girls. How many boys are there?
  25. 25.548 + 397 =
  26. 26.846 + ? = 995
  27. 27.177 + ? = 288
  28. 28.375 + 560 =
  29. 29.A school has 914 children. 663 of them are girls. How many boys are there?
  30. 30.242 + 130 =
  31. 31.A train has 746 people in the front coaches and 181 people in the back coaches. How many people are on the train?
  32. 32.A school has 564 children. 400 of them are girls. How many boys are there?
  33. 33.449 + 423 =
  34. 34.? − 416 = 14
  35. 35.405 − 134 =
  36. 36.899 − 349 =
  37. 37.A train has 355 people in the front coaches and 262 people in the back coaches. How many people are on the train?
  38. 38.341 − 272 =
  39. 39.? − 125 = 204
  40. 40.? + 724 = 901

Answer key

  1. 208
  2. 999
  3. 652
  4. 70
  5. 102
  6. 36
  7. 197
  8. 104
  9. 455
  10. 9
  11. 633
  12. 276
  13. 220
  14. 22
  15. 878
  16. 197
  17. 78
  18. 728
  19. 471
  20. 720
  21. 783
  22. 308
  23. 200
  24. 585
  25. 945
  26. 149
  27. 111
  28. 935
  29. 251
  30. 372
  31. 927
  32. 164
  33. 872
  34. 430
  35. 271
  36. 550
  37. 617
  38. 69
  39. 329
  40. 177

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