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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 277 · 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 256 children. 135 of them are girls. How many boys are there?
  2. 2.734 + 164 =
  3. 3.646 + 171 =
  4. 4.502 − 328 =
  5. 5.A school has 268 children. 242 of them are girls. How many boys are there?
  6. 6.480 − 413 =
  7. 7.262 + ? = 641
  8. 8.110 + ? = 617
  9. 9.? − 425 = 179
  10. 10.A train has 282 people in the front coaches and 247 people in the back coaches. How many people are on the train?
  11. 11.237 + 263 =
  12. 12.? + 198 = 796
  13. 13.A train has 861 people in the front coaches and 111 people in the back coaches. How many people are on the train?
  14. 14.271 + 176 =
  15. 15.692 + 105 =
  16. 16.168 + 281 =
  17. 17.906 − 116 =
  18. 18.604 + ? = 994
  19. 19.A train has 594 people in the front coaches and 119 people in the back coaches. How many people are on the train?
  20. 20.A train has 666 people in the front coaches and 237 people in the back coaches. How many people are on the train?
  21. 21.? + 596 = 976
  22. 22.? − 272 = 125
  23. 23.318 − 190 =
  24. 24.? + 501 = 961
  25. 25.? + 537 = 715
  26. 26.897 + ? = 997
  27. 27.695 − 430 =
  28. 28.562 + 260 =
  29. 29.A school has 413 children. 251 of them are girls. How many boys are there?
  30. 30.517 − ? = 410
  31. 31.A train has 375 people in the front coaches and 440 people in the back coaches. How many people are on the train?
  32. 32.A school has 797 children. 726 of them are girls. How many boys are there?
  33. 33.A school has 720 children. 588 of them are girls. How many boys are there?
  34. 34.252 − 246 =
  35. 35.A train has 272 people in the front coaches and 592 people in the back coaches. How many people are on the train?
  36. 36.A school has 212 children. 144 of them are girls. How many boys are there?
  37. 37.? − 428 = 78
  38. 38.833 + 120 =
  39. 39.? + 529 = 745
  40. 40.A school has 313 children. 280 of them are girls. How many boys are there?

Answer key

  1. 121
  2. 898
  3. 817
  4. 174
  5. 26
  6. 67
  7. 379
  8. 507
  9. 604
  10. 529
  11. 500
  12. 598
  13. 972
  14. 447
  15. 797
  16. 449
  17. 790
  18. 390
  19. 713
  20. 903
  21. 380
  22. 397
  23. 128
  24. 460
  25. 178
  26. 100
  27. 265
  28. 822
  29. 162
  30. 107
  31. 815
  32. 71
  33. 132
  34. 6
  35. 864
  36. 68
  37. 506
  38. 953
  39. 216
  40. 33

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