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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 300 · 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. 1.803 − 662 =
  2. 2.668 + ? = 870
  3. 3.A train has 462 people in the front coaches and 222 people in the back coaches. How many people are on the train?
  4. 4.A school has 827 children. 684 of them are girls. How many boys are there?
  5. 5.A train has 518 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  6. 6.556 − ? = 369
  7. 7.A school has 711 children. 208 of them are girls. How many boys are there?
  8. 8.621 + 228 =
  9. 9.A train has 238 people in the front coaches and 264 people in the back coaches. How many people are on the train?
  10. 10.? + 206 = 853
  11. 11.579 + 229 =
  12. 12.A train has 490 people in the front coaches and 422 people in the back coaches. How many people are on the train?
  13. 13.135 + ? = 526
  14. 14.393 + 470 =
  15. 15.A train has 185 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  16. 16.370 − 274 =
  17. 17.347 − ? = 234
  18. 18.? + 533 = 655
  19. 19.931 − ? = 71
  20. 20.A school has 300 children. 153 of them are girls. How many boys are there?
  21. 21.838 + ? = 998
  22. 22.A train has 391 people in the front coaches and 217 people in the back coaches. How many people are on the train?
  23. 23.212 + 271 =
  24. 24.434 − 113 =
  25. 25.? + 187 = 498
  26. 26.A school has 310 children. 245 of them are girls. How many boys are there?
  27. 27.269 − 182 =
  28. 28.A train has 701 people in the front coaches and 228 people in the back coaches. How many people are on the train?
  29. 29.A train has 224 people in the front coaches and 653 people in the back coaches. How many people are on the train?
  30. 30.A school has 326 children. 146 of them are girls. How many boys are there?
  31. 31.581 + 233 =
  32. 32.334 − 210 =
  33. 33.517 + 158 =
  34. 34.146 + ? = 534
  35. 35.A train has 770 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  36. 36.A school has 839 children. 269 of them are girls. How many boys are there?
  37. 37.671 + 326 =
  38. 38.717 − 675 =
  39. 39.999 − 220 =
  40. 40.A school has 353 children. 242 of them are girls. How many boys are there?

Answer key

  1. 141
  2. 202
  3. 684
  4. 143
  5. 625
  6. 187
  7. 503
  8. 849
  9. 502
  10. 647
  11. 808
  12. 912
  13. 391
  14. 863
  15. 293
  16. 96
  17. 113
  18. 122
  19. 860
  20. 147
  21. 160
  22. 608
  23. 483
  24. 321
  25. 311
  26. 65
  27. 87
  28. 929
  29. 877
  30. 180
  31. 814
  32. 124
  33. 675
  34. 388
  35. 907
  36. 570
  37. 997
  38. 42
  39. 779
  40. 111

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