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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 870 · 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.? − 219 = 142
  2. 2.? + 268 = 892
  3. 3.A train has 385 people in the front coaches and 240 people in the back coaches. How many people are on the train?
  4. 4.? − 182 = 63
  5. 5.A train has 273 people in the front coaches and 618 people in the back coaches. How many people are on the train?
  6. 6.? + 149 = 404
  7. 7.A school has 987 children. 190 of them are girls. How many boys are there?
  8. 8.? + 400 = 912
  9. 9.853 + 124 =
  10. 10.796 − 564 =
  11. 11.A train has 305 people in the front coaches and 405 people in the back coaches. How many people are on the train?
  12. 12.389 − 261 =
  13. 13.? + 241 = 513
  14. 14.A school has 240 children. 108 of them are girls. How many boys are there?
  15. 15.577 + ? = 797
  16. 16.A school has 562 children. 175 of them are girls. How many boys are there?
  17. 17.284 + 232 =
  18. 18.A train has 365 people in the front coaches and 176 people in the back coaches. How many people are on the train?
  19. 19.? + 391 = 642
  20. 20.A school has 441 children. 235 of them are girls. How many boys are there?
  21. 21.A train has 339 people in the front coaches and 143 people in the back coaches. How many people are on the train?
  22. 22.854 − 534 =
  23. 23.866 + ? = 997
  24. 24.A train has 703 people in the front coaches and 129 people in the back coaches. How many people are on the train?
  25. 25.320 − ? = 48
  26. 26.243 + 490 =
  27. 27.241 − 127 =
  28. 28.316 − 107 =
  29. 29.771 − ? = 392
  30. 30.816 − 326 =
  31. 31.981 − 933 =
  32. 32.481 + 458 =
  33. 33.A train has 182 people in the front coaches and 561 people in the back coaches. How many people are on the train?
  34. 34.687 + 166 =
  35. 35.171 + 570 =
  36. 36.501 + 296 =
  37. 37.664 − 644 =
  38. 38.541 + 254 =
  39. 39.780 − ? = 625
  40. 40.A school has 805 children. 479 of them are girls. How many boys are there?

Answer key

  1. 361
  2. 624
  3. 625
  4. 245
  5. 891
  6. 255
  7. 797
  8. 512
  9. 977
  10. 232
  11. 710
  12. 128
  13. 272
  14. 132
  15. 220
  16. 387
  17. 516
  18. 541
  19. 251
  20. 206
  21. 482
  22. 320
  23. 131
  24. 832
  25. 272
  26. 733
  27. 114
  28. 209
  29. 379
  30. 490
  31. 48
  32. 939
  33. 743
  34. 853
  35. 741
  36. 797
  37. 20
  38. 795
  39. 155
  40. 326

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