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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 310 · 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 295 children. 256 of them are girls. How many boys are there?
  2. 2.? + 558 = 831
  3. 3.628 + ? = 810
  4. 4.A train has 371 people in the front coaches and 328 people in the back coaches. How many people are on the train?
  5. 5.573 + 312 =
  6. 6.? − 342 = 121
  7. 7.A train has 187 people in the front coaches and 623 people in the back coaches. How many people are on the train?
  8. 8.? + 468 = 925
  9. 9.542 − 446 =
  10. 10.455 + 463 =
  11. 11.727 − 608 =
  12. 12.571 + 173 =
  13. 13.? + 689 = 949
  14. 14.196 + 476 =
  15. 15.A train has 591 people in the front coaches and 129 people in the back coaches. How many people are on the train?
  16. 16.A train has 745 people in the front coaches and 202 people in the back coaches. How many people are on the train?
  17. 17.A train has 373 people in the front coaches and 356 people in the back coaches. How many people are on the train?
  18. 18.888 + ? = 990
  19. 19.268 + 692 =
  20. 20.? + 633 = 806
  21. 21.267 + 390 =
  22. 22.700 + 147 =
  23. 23.675 + ? = 839
  24. 24.A school has 246 children. 217 of them are girls. How many boys are there?
  25. 25.710 − ? = 12
  26. 26.? + 502 = 635
  27. 27.? + 691 = 994
  28. 28.A train has 595 people in the front coaches and 279 people in the back coaches. How many people are on the train?
  29. 29.328 + 137 =
  30. 30.200 + 281 =
  31. 31.830 − ? = 700
  32. 32.304 − 126 =
  33. 33.263 + 125 =
  34. 34.874 + ? = 977
  35. 35.552 − ? = 420
  36. 36.? − 340 = 422
  37. 37.753 − 369 =
  38. 38.439 + 265 =
  39. 39.A school has 996 children. 430 of them are girls. How many boys are there?
  40. 40.205 − 166 =

Answer key

  1. 39
  2. 273
  3. 182
  4. 699
  5. 885
  6. 463
  7. 810
  8. 457
  9. 96
  10. 918
  11. 119
  12. 744
  13. 260
  14. 672
  15. 720
  16. 947
  17. 729
  18. 102
  19. 960
  20. 173
  21. 657
  22. 847
  23. 164
  24. 29
  25. 698
  26. 133
  27. 303
  28. 874
  29. 465
  30. 481
  31. 130
  32. 178
  33. 388
  34. 103
  35. 132
  36. 762
  37. 384
  38. 704
  39. 566
  40. 39

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