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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 324 · 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 train has 453 people in the front coaches and 514 people in the back coaches. How many people are on the train?
  2. 2.? − 772 = 67
  3. 3.140 + ? = 529
  4. 4.856 − 703 =
  5. 5.A school has 634 children. 152 of them are girls. How many boys are there?
  6. 6.A school has 544 children. 116 of them are girls. How many boys are there?
  7. 7.328 − 310 =
  8. 8.692 − 540 =
  9. 9.513 − 477 =
  10. 10.172 + 733 =
  11. 11.674 − 470 =
  12. 12.? + 384 = 660
  13. 13.863 − 375 =
  14. 14.248 − 150 =
  15. 15.109 + 790 =
  16. 16.505 + ? = 786
  17. 17.A school has 529 children. 509 of them are girls. How many boys are there?
  18. 18.226 − 212 =
  19. 19.A school has 555 children. 180 of them are girls. How many boys are there?
  20. 20.446 − ? = 128
  21. 21.A train has 305 people in the front coaches and 561 people in the back coaches. How many people are on the train?
  22. 22.? + 146 = 652
  23. 23.A train has 259 people in the front coaches and 520 people in the back coaches. How many people are on the train?
  24. 24.722 + 235 =
  25. 25.447 − ? = 185
  26. 26.A train has 758 people in the front coaches and 136 people in the back coaches. How many people are on the train?
  27. 27.A train has 723 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  28. 28.? − 244 = 69
  29. 29.612 − 382 =
  30. 30.A school has 557 children. 117 of them are girls. How many boys are there?
  31. 31.216 + 396 =
  32. 32.445 − 166 =
  33. 33.? − 228 = 228
  34. 34.804 − 392 =
  35. 35.A school has 553 children. 296 of them are girls. How many boys are there?
  36. 36.613 − 513 =
  37. 37.460 − 241 =
  38. 38.? − 305 = 393
  39. 39.A train has 457 people in the front coaches and 274 people in the back coaches. How many people are on the train?
  40. 40.315 − 123 =

Answer key

  1. 967
  2. 839
  3. 389
  4. 153
  5. 482
  6. 428
  7. 18
  8. 152
  9. 36
  10. 905
  11. 204
  12. 276
  13. 488
  14. 98
  15. 899
  16. 281
  17. 20
  18. 14
  19. 375
  20. 318
  21. 866
  22. 506
  23. 779
  24. 957
  25. 262
  26. 894
  27. 824
  28. 313
  29. 230
  30. 440
  31. 612
  32. 279
  33. 456
  34. 412
  35. 257
  36. 100
  37. 219
  38. 698
  39. 731
  40. 192

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