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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 363 · 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. 1.636 + 279 =
  2. 2.? − 115 = 661
  3. 3.A school has 216 children. 173 of them are girls. How many boys are there?
  4. 4.767 + 135 =
  5. 5.359 − 244 =
  6. 6.A school has 960 children. 257 of them are girls. How many boys are there?
  7. 7.286 + 580 =
  8. 8.A school has 209 children. 111 of them are girls. How many boys are there?
  9. 9.174 + ? = 413
  10. 10.A train has 213 people in the front coaches and 158 people in the back coaches. How many people are on the train?
  11. 11.A school has 299 children. 260 of them are girls. How many boys are there?
  12. 12.457 − 187 =
  13. 13.668 + ? = 933
  14. 14.A school has 702 children. 404 of them are girls. How many boys are there?
  15. 15.322 − 122 =
  16. 16.268 + ? = 506
  17. 17.216 + ? = 348
  18. 18.260 + 585 =
  19. 19.460 − 347 =
  20. 20.A school has 489 children. 330 of them are girls. How many boys are there?
  21. 21.638 + 131 =
  22. 22.738 + ? = 960
  23. 23.? − 121 = 585
  24. 24.414 + 483 =
  25. 25.? + 702 = 829
  26. 26.999 − 199 =
  27. 27.843 + 102 =
  28. 28.544 + 404 =
  29. 29.435 + ? = 775
  30. 30.726 − 418 =
  31. 31.A school has 672 children. 493 of them are girls. How many boys are there?
  32. 32.529 + 119 =
  33. 33.654 + 113 =
  34. 34.353 + 189 =
  35. 35.A train has 283 people in the front coaches and 499 people in the back coaches. How many people are on the train?
  36. 36.165 + 152 =
  37. 37.A train has 173 people in the front coaches and 122 people in the back coaches. How many people are on the train?
  38. 38.A school has 799 children. 413 of them are girls. How many boys are there?
  39. 39.A train has 520 people in the front coaches and 182 people in the back coaches. How many people are on the train?
  40. 40.124 + 787 =

Answer key

  1. 915
  2. 776
  3. 43
  4. 902
  5. 115
  6. 703
  7. 866
  8. 98
  9. 239
  10. 371
  11. 39
  12. 270
  13. 265
  14. 298
  15. 200
  16. 238
  17. 132
  18. 845
  19. 113
  20. 159
  21. 769
  22. 222
  23. 706
  24. 897
  25. 127
  26. 800
  27. 945
  28. 948
  29. 340
  30. 308
  31. 179
  32. 648
  33. 767
  34. 542
  35. 782
  36. 317
  37. 295
  38. 386
  39. 702
  40. 911

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