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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 346 · 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.? − 104 = 102
  2. 2.A train has 197 people in the front coaches and 264 people in the back coaches. How many people are on the train?
  3. 3.437 − 348 =
  4. 4.365 + ? = 585
  5. 5.A train has 531 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  6. 6.? + 533 = 906
  7. 7.452 + 532 =
  8. 8.530 + 334 =
  9. 9.A train has 198 people in the front coaches and 370 people in the back coaches. How many people are on the train?
  10. 10.? + 441 = 881
  11. 11.? + 607 = 742
  12. 12.A school has 619 children. 447 of them are girls. How many boys are there?
  13. 13.905 − 643 =
  14. 14.389 + ? = 819
  15. 15.205 + ? = 979
  16. 16.237 − 236 =
  17. 17.859 − 325 =
  18. 18.274 + 404 =
  19. 19.521 + 182 =
  20. 20.A train has 180 people in the front coaches and 429 people in the back coaches. How many people are on the train?
  21. 21.371 − 175 =
  22. 22.113 + 150 =
  23. 23.418 − 113 =
  24. 24.A school has 757 children. 445 of them are girls. How many boys are there?
  25. 25.547 − 503 =
  26. 26.286 + 679 =
  27. 27.721 + ? = 892
  28. 28.368 − ? = 226
  29. 29.A school has 302 children. 121 of them are girls. How many boys are there?
  30. 30.413 + 366 =
  31. 31.313 + 209 =
  32. 32.A train has 643 people in the front coaches and 140 people in the back coaches. How many people are on the train?
  33. 33.A school has 725 children. 560 of them are girls. How many boys are there?
  34. 34.A train has 677 people in the front coaches and 171 people in the back coaches. How many people are on the train?
  35. 35.264 − 232 =
  36. 36.878 − ? = 431
  37. 37.A train has 767 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  38. 38.? + 587 = 873
  39. 39.419 + 560 =
  40. 40.330 + 405 =

Answer key

  1. 206
  2. 461
  3. 89
  4. 220
  5. 648
  6. 373
  7. 984
  8. 864
  9. 568
  10. 440
  11. 135
  12. 172
  13. 262
  14. 430
  15. 774
  16. 1
  17. 534
  18. 678
  19. 703
  20. 609
  21. 196
  22. 263
  23. 305
  24. 312
  25. 44
  26. 965
  27. 171
  28. 142
  29. 181
  30. 779
  31. 522
  32. 783
  33. 165
  34. 848
  35. 32
  36. 447
  37. 873
  38. 286
  39. 979
  40. 735

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