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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 185 · 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. 1.788 + 126 =
  2. 2.273 − ? = 49
  3. 3.A train has 574 people in the front coaches and 382 people in the back coaches. How many people are on the train?
  4. 4.981 − 603 =
  5. 5.A school has 283 children. 126 of them are girls. How many boys are there?
  6. 6.? + 731 = 994
  7. 7.A train has 311 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  8. 8.420 − 206 =
  9. 9.? + 280 = 584
  10. 10.617 + 118 =
  11. 11.A school has 600 children. 433 of them are girls. How many boys are there?
  12. 12.A train has 210 people in the front coaches and 306 people in the back coaches. How many people are on the train?
  13. 13.649 + 183 =
  14. 14.626 + 165 =
  15. 15.297 − ? = 169
  16. 16.866 − 163 =
  17. 17.583 − 561 =
  18. 18.258 + 118 =
  19. 19.265 − 264 =
  20. 20.A school has 317 children. 174 of them are girls. How many boys are there?
  21. 21.429 − 122 =
  22. 22.A school has 898 children. 690 of them are girls. How many boys are there?
  23. 23.A train has 469 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  24. 24.272 + 691 =
  25. 25.A school has 233 children. 105 of them are girls. How many boys are there?
  26. 26.A school has 843 children. 731 of them are girls. How many boys are there?
  27. 27.? + 676 = 962
  28. 28.A school has 765 children. 389 of them are girls. How many boys are there?
  29. 29.? − 214 = 146
  30. 30.A school has 223 children. 177 of them are girls. How many boys are there?
  31. 31.782 + ? = 990
  32. 32.? + 670 = 813
  33. 33.? − 537 = 422
  34. 34.A train has 798 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  35. 35.726 + 233 =
  36. 36.A school has 945 children. 349 of them are girls. How many boys are there?
  37. 37.698 − ? = 187
  38. 38.? − 448 = 188
  39. 39.272 − 268 =
  40. 40.A train has 493 people in the front coaches and 100 people in the back coaches. How many people are on the train?

Answer key

  1. 914
  2. 224
  3. 956
  4. 378
  5. 157
  6. 263
  7. 436
  8. 214
  9. 304
  10. 735
  11. 167
  12. 516
  13. 832
  14. 791
  15. 128
  16. 703
  17. 22
  18. 376
  19. 1
  20. 143
  21. 307
  22. 208
  23. 606
  24. 963
  25. 128
  26. 112
  27. 286
  28. 376
  29. 360
  30. 46
  31. 208
  32. 143
  33. 959
  34. 902
  35. 959
  36. 596
  37. 511
  38. 636
  39. 4
  40. 593

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