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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 733 · 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. 1.606 − 168 =
  2. 2.478 + 488 =
  3. 3.A train has 721 people in the front coaches and 226 people in the back coaches. How many people are on the train?
  4. 4.305 + 434 =
  5. 5.A school has 808 children. 706 of them are girls. How many boys are there?
  6. 6.759 − 660 =
  7. 7.? + 595 = 753
  8. 8.? − 166 = 346
  9. 9.A school has 397 children. 134 of them are girls. How many boys are there?
  10. 10.847 − 524 =
  11. 11.? − 144 = 216
  12. 12.903 − ? = 183
  13. 13.? − 142 = 99
  14. 14.A school has 673 children. 575 of them are girls. How many boys are there?
  15. 15.742 + 222 =
  16. 16.164 + 313 =
  17. 17.A train has 147 people in the front coaches and 603 people in the back coaches. How many people are on the train?
  18. 18.140 + 698 =
  19. 19.815 − ? = 44
  20. 20.125 + 113 =
  21. 21.? + 582 = 889
  22. 22.A train has 332 people in the front coaches and 188 people in the back coaches. How many people are on the train?
  23. 23.849 + ? = 987
  24. 24.579 + 287 =
  25. 25.183 + ? = 770
  26. 26.A school has 562 children. 296 of them are girls. How many boys are there?
  27. 27.A train has 822 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  28. 28.661 + 269 =
  29. 29.305 − ? = 165
  30. 30.259 + 737 =
  31. 31.A school has 392 children. 233 of them are girls. How many boys are there?
  32. 32.A school has 306 children. 242 of them are girls. How many boys are there?
  33. 33.703 + 263 =
  34. 34.? + 445 = 848
  35. 35.A school has 227 children. 208 of them are girls. How many boys are there?
  36. 36.724 − 292 =
  37. 37.677 − 675 =
  38. 38.400 − ? = 49
  39. 39.317 + 546 =
  40. 40.686 − 537 =

Answer key

  1. 438
  2. 966
  3. 947
  4. 739
  5. 102
  6. 99
  7. 158
  8. 512
  9. 263
  10. 323
  11. 360
  12. 720
  13. 241
  14. 98
  15. 964
  16. 477
  17. 750
  18. 838
  19. 771
  20. 238
  21. 307
  22. 520
  23. 138
  24. 866
  25. 587
  26. 266
  27. 929
  28. 930
  29. 140
  30. 996
  31. 159
  32. 64
  33. 966
  34. 403
  35. 19
  36. 432
  37. 2
  38. 351
  39. 863
  40. 149

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