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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 526 · 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. 1.527 − ? = 253
  2. 2.A school has 660 children. 647 of them are girls. How many boys are there?
  3. 3.A train has 243 people in the front coaches and 486 people in the back coaches. How many people are on the train?
  4. 4.849 + ? = 961
  5. 5.960 − 808 =
  6. 6.A school has 807 children. 376 of them are girls. How many boys are there?
  7. 7.512 − 350 =
  8. 8.376 − 134 =
  9. 9.? + 213 = 360
  10. 10.A school has 485 children. 239 of them are girls. How many boys are there?
  11. 11.A train has 352 people in the front coaches and 517 people in the back coaches. How many people are on the train?
  12. 12.483 + ? = 767
  13. 13.367 − 270 =
  14. 14.478 − ? = 223
  15. 15.? − 380 = 370
  16. 16.811 + 158 =
  17. 17.746 − 355 =
  18. 18.? + 121 = 833
  19. 19.634 − 368 =
  20. 20.A school has 599 children. 118 of them are girls. How many boys are there?
  21. 21.? − 123 = 328
  22. 22.451 + 474 =
  23. 23.A train has 127 people in the front coaches and 437 people in the back coaches. How many people are on the train?
  24. 24.831 + ? = 955
  25. 25.A school has 517 children. 477 of them are girls. How many boys are there?
  26. 26.575 − 277 =
  27. 27.772 + 131 =
  28. 28.403 + 243 =
  29. 29.A train has 637 people in the front coaches and 215 people in the back coaches. How many people are on the train?
  30. 30.A train has 579 people in the front coaches and 185 people in the back coaches. How many people are on the train?
  31. 31.A school has 645 children. 449 of them are girls. How many boys are there?
  32. 32.802 − ? = 623
  33. 33.228 − ? = 17
  34. 34.A school has 790 children. 747 of them are girls. How many boys are there?
  35. 35.722 + 112 =
  36. 36.622 + 195 =
  37. 37.101 + ? = 737
  38. 38.776 + ? = 917
  39. 39.843 + 104 =
  40. 40.882 − 184 =

Answer key

  1. 274
  2. 13
  3. 729
  4. 112
  5. 152
  6. 431
  7. 162
  8. 242
  9. 147
  10. 246
  11. 869
  12. 284
  13. 97
  14. 255
  15. 750
  16. 969
  17. 391
  18. 712
  19. 266
  20. 481
  21. 451
  22. 925
  23. 564
  24. 124
  25. 40
  26. 298
  27. 903
  28. 646
  29. 852
  30. 764
  31. 196
  32. 179
  33. 211
  34. 43
  35. 834
  36. 817
  37. 636
  38. 141
  39. 947
  40. 698

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