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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 551 · 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. 1.323 + 183 =
  2. 2.909 − 168 =
  3. 3.730 + ? = 833
  4. 4.231 + 263 =
  5. 5.531 − 142 =
  6. 6.469 − 349 =
  7. 7.218 − 129 =
  8. 8.A train has 508 people in the front coaches and 424 people in the back coaches. How many people are on the train?
  9. 9.A school has 650 children. 120 of them are girls. How many boys are there?
  10. 10.405 − ? = 295
  11. 11.A school has 717 children. 326 of them are girls. How many boys are there?
  12. 12.806 − 427 =
  13. 13.739 + 180 =
  14. 14.313 − 266 =
  15. 15.883 + 100 =
  16. 16.136 + 765 =
  17. 17.A train has 313 people in the front coaches and 166 people in the back coaches. How many people are on the train?
  18. 18.? − 111 = 738
  19. 19.? − 483 = 471
  20. 20.699 − ? = 26
  21. 21.483 + 447 =
  22. 22.489 − 298 =
  23. 23.A train has 280 people in the front coaches and 201 people in the back coaches. How many people are on the train?
  24. 24.493 − 188 =
  25. 25.688 − 109 =
  26. 26.A train has 237 people in the front coaches and 729 people in the back coaches. How many people are on the train?
  27. 27.578 + 143 =
  28. 28.754 − 566 =
  29. 29.812 + 131 =
  30. 30.? − 104 = 164
  31. 31.340 + 257 =
  32. 32.682 + 300 =
  33. 33.A school has 901 children. 279 of them are girls. How many boys are there?
  34. 34.? + 325 = 787
  35. 35.A train has 844 people in the front coaches and 154 people in the back coaches. How many people are on the train?
  36. 36.104 + 587 =
  37. 37.462 + ? = 716
  38. 38.A train has 214 people in the front coaches and 743 people in the back coaches. How many people are on the train?
  39. 39.654 + ? = 918
  40. 40.400 − ? = 40

Answer key

  1. 506
  2. 741
  3. 103
  4. 494
  5. 389
  6. 120
  7. 89
  8. 932
  9. 530
  10. 110
  11. 391
  12. 379
  13. 919
  14. 47
  15. 983
  16. 901
  17. 479
  18. 849
  19. 954
  20. 673
  21. 930
  22. 191
  23. 481
  24. 305
  25. 579
  26. 966
  27. 721
  28. 188
  29. 943
  30. 268
  31. 597
  32. 982
  33. 622
  34. 462
  35. 998
  36. 691
  37. 254
  38. 957
  39. 264
  40. 360

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