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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 625 · 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 school has 495 children. 420 of them are girls. How many boys are there?
  2. 2.285 − 143 =
  3. 3.638 − 139 =
  4. 4.637 + 187 =
  5. 5.A train has 593 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  6. 6.? − 199 = 324
  7. 7.A school has 823 children. 583 of them are girls. How many boys are there?
  8. 8.297 − ? = 186
  9. 9.197 + 233 =
  10. 10.? + 125 = 821
  11. 11.770 − 291 =
  12. 12.679 − 342 =
  13. 13.A school has 867 children. 769 of them are girls. How many boys are there?
  14. 14.? − 197 = 530
  15. 15.A school has 366 children. 222 of them are girls. How many boys are there?
  16. 16.222 − 179 =
  17. 17.191 + ? = 354
  18. 18.837 − ? = 547
  19. 19.113 + 425 =
  20. 20.203 + ? = 306
  21. 21.168 + 583 =
  22. 22.820 + 142 =
  23. 23.243 + 174 =
  24. 24.A train has 771 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  25. 25.829 + 137 =
  26. 26.A school has 494 children. 105 of them are girls. How many boys are there?
  27. 27.667 + 150 =
  28. 28.538 + 154 =
  29. 29.656 − 322 =
  30. 30.A train has 257 people in the front coaches and 450 people in the back coaches. How many people are on the train?
  31. 31.326 − 297 =
  32. 32.A train has 397 people in the front coaches and 344 people in the back coaches. How many people are on the train?
  33. 33.? − 393 = 298
  34. 34.872 − 770 =
  35. 35.641 − 138 =
  36. 36.545 + 229 =
  37. 37.539 − 209 =
  38. 38.? − 415 = 276
  39. 39.? − 463 = 516
  40. 40.469 − 249 =

Answer key

  1. 75
  2. 142
  3. 499
  4. 824
  5. 710
  6. 523
  7. 240
  8. 111
  9. 430
  10. 696
  11. 479
  12. 337
  13. 98
  14. 727
  15. 144
  16. 43
  17. 163
  18. 290
  19. 538
  20. 103
  21. 751
  22. 962
  23. 417
  24. 908
  25. 966
  26. 389
  27. 817
  28. 692
  29. 334
  30. 707
  31. 29
  32. 741
  33. 691
  34. 102
  35. 503
  36. 774
  37. 330
  38. 691
  39. 979
  40. 220

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