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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 317 · 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 train has 500 people in the front coaches and 438 people in the back coaches. How many people are on the train?
  2. 2.A train has 653 people in the front coaches and 179 people in the back coaches. How many people are on the train?
  3. 3.997 − 515 =
  4. 4.656 + ? = 769
  5. 5.312 + 686 =
  6. 6.819 − 564 =
  7. 7.891 − ? = 249
  8. 8.845 − ? = 164
  9. 9.845 − 670 =
  10. 10.689 + 284 =
  11. 11.? + 749 = 994
  12. 12.669 + ? = 794
  13. 13.863 + 118 =
  14. 14.727 − 235 =
  15. 15.A school has 341 children. 121 of them are girls. How many boys are there?
  16. 16.? − 672 = 180
  17. 17.A train has 229 people in the front coaches and 445 people in the back coaches. How many people are on the train?
  18. 18.? + 270 = 428
  19. 19.? − 116 = 484
  20. 20.A train has 398 people in the front coaches and 360 people in the back coaches. How many people are on the train?
  21. 21.769 − 148 =
  22. 22.? + 651 = 817
  23. 23.343 − ? = 200
  24. 24.359 − 273 =
  25. 25.A train has 885 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  26. 26.388 + ? = 498
  27. 27.691 + ? = 868
  28. 28.? + 105 = 318
  29. 29.905 − 304 =
  30. 30.671 − 131 =
  31. 31.? − 105 = 122
  32. 32.510 − 414 =
  33. 33.533 − 142 =
  34. 34.696 + 112 =
  35. 35.A train has 170 people in the front coaches and 375 people in the back coaches. How many people are on the train?
  36. 36.A train has 745 people in the front coaches and 128 people in the back coaches. How many people are on the train?
  37. 37.A school has 423 children. 131 of them are girls. How many boys are there?
  38. 38.325 + 607 =
  39. 39.901 − ? = 44
  40. 40.? + 177 = 660

Answer key

  1. 938
  2. 832
  3. 482
  4. 113
  5. 998
  6. 255
  7. 642
  8. 681
  9. 175
  10. 973
  11. 245
  12. 125
  13. 981
  14. 492
  15. 220
  16. 852
  17. 674
  18. 158
  19. 600
  20. 758
  21. 621
  22. 166
  23. 143
  24. 86
  25. 991
  26. 110
  27. 177
  28. 213
  29. 601
  30. 540
  31. 227
  32. 96
  33. 391
  34. 808
  35. 545
  36. 873
  37. 292
  38. 932
  39. 857
  40. 483

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