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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 762 · 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 school has 415 children. 128 of them are girls. How many boys are there?
  2. 2.? − 287 = 9
  3. 3.395 − 361 =
  4. 4.816 + ? = 936
  5. 5.881 + ? = 993
  6. 6.694 − 658 =
  7. 7.? + 324 = 504
  8. 8.A train has 256 people in the front coaches and 421 people in the back coaches. How many people are on the train?
  9. 9.825 − 354 =
  10. 10.A school has 589 children. 579 of them are girls. How many boys are there?
  11. 11.A train has 585 people in the front coaches and 405 people in the back coaches. How many people are on the train?
  12. 12.498 + 388 =
  13. 13.843 + 154 =
  14. 14.772 + 180 =
  15. 15.A school has 617 children. 470 of them are girls. How many boys are there?
  16. 16.A school has 372 children. 121 of them are girls. How many boys are there?
  17. 17.677 + 224 =
  18. 18.? + 219 = 555
  19. 19.632 − ? = 7
  20. 20.? + 405 = 672
  21. 21.A train has 392 people in the front coaches and 433 people in the back coaches. How many people are on the train?
  22. 22.A train has 527 people in the front coaches and 254 people in the back coaches. How many people are on the train?
  23. 23.A train has 443 people in the front coaches and 409 people in the back coaches. How many people are on the train?
  24. 24.382 + 509 =
  25. 25.A school has 729 children. 336 of them are girls. How many boys are there?
  26. 26.? − 217 = 446
  27. 27.A train has 709 people in the front coaches and 231 people in the back coaches. How many people are on the train?
  28. 28.A train has 174 people in the front coaches and 775 people in the back coaches. How many people are on the train?
  29. 29.A train has 373 people in the front coaches and 569 people in the back coaches. How many people are on the train?
  30. 30.A school has 667 children. 514 of them are girls. How many boys are there?
  31. 31.457 − ? = 123
  32. 32.875 + 112 =
  33. 33.650 + 212 =
  34. 34.841 + 103 =
  35. 35.867 + ? = 991
  36. 36.517 − ? = 159
  37. 37.A school has 512 children. 368 of them are girls. How many boys are there?
  38. 38.A school has 572 children. 496 of them are girls. How many boys are there?
  39. 39.704 − 185 =
  40. 40.A school has 504 children. 368 of them are girls. How many boys are there?

Answer key

  1. 287
  2. 296
  3. 34
  4. 120
  5. 112
  6. 36
  7. 180
  8. 677
  9. 471
  10. 10
  11. 990
  12. 886
  13. 997
  14. 952
  15. 147
  16. 251
  17. 901
  18. 336
  19. 625
  20. 267
  21. 825
  22. 781
  23. 852
  24. 891
  25. 393
  26. 663
  27. 940
  28. 949
  29. 942
  30. 153
  31. 334
  32. 987
  33. 862
  34. 944
  35. 124
  36. 358
  37. 144
  38. 76
  39. 519
  40. 136

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