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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 499 · 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. 1.851 + 101 =
  2. 2.A school has 362 children. 340 of them are girls. How many boys are there?
  3. 3.773 + 147 =
  4. 4.691 + 113 =
  5. 5.A train has 111 people in the front coaches and 634 people in the back coaches. How many people are on the train?
  6. 6.143 + 334 =
  7. 7.A train has 474 people in the front coaches and 177 people in the back coaches. How many people are on the train?
  8. 8.402 − ? = 73
  9. 9.637 + 196 =
  10. 10.? + 617 = 849
  11. 11.A school has 512 children. 483 of them are girls. How many boys are there?
  12. 12.357 − 278 =
  13. 13.335 + 651 =
  14. 14.637 + 200 =
  15. 15.A school has 872 children. 713 of them are girls. How many boys are there?
  16. 16.A train has 804 people in the front coaches and 156 people in the back coaches. How many people are on the train?
  17. 17.915 − 554 =
  18. 18.? + 861 = 994
  19. 19.379 − 211 =
  20. 20.478 − 264 =
  21. 21.199 + 630 =
  22. 22.587 + 364 =
  23. 23.A train has 779 people in the front coaches and 220 people in the back coaches. How many people are on the train?
  24. 24.A train has 835 people in the front coaches and 154 people in the back coaches. How many people are on the train?
  25. 25.A school has 306 children. 295 of them are girls. How many boys are there?
  26. 26.A school has 665 children. 190 of them are girls. How many boys are there?
  27. 27.A school has 601 children. 337 of them are girls. How many boys are there?
  28. 28.494 − 257 =
  29. 29.A train has 422 people in the front coaches and 304 people in the back coaches. How many people are on the train?
  30. 30.A school has 564 children. 437 of them are girls. How many boys are there?
  31. 31.A school has 574 children. 201 of them are girls. How many boys are there?
  32. 32.982 − ? = 296
  33. 33.731 − 377 =
  34. 34.837 + 115 =
  35. 35.446 − 349 =
  36. 36.461 + 336 =
  37. 37.117 + 542 =
  38. 38.A school has 936 children. 693 of them are girls. How many boys are there?
  39. 39.A train has 889 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  40. 40.503 + ? = 619

Answer key

  1. 952
  2. 22
  3. 920
  4. 804
  5. 745
  6. 477
  7. 651
  8. 329
  9. 833
  10. 232
  11. 29
  12. 79
  13. 986
  14. 837
  15. 159
  16. 960
  17. 361
  18. 133
  19. 168
  20. 214
  21. 829
  22. 951
  23. 999
  24. 989
  25. 11
  26. 475
  27. 264
  28. 237
  29. 726
  30. 127
  31. 373
  32. 686
  33. 354
  34. 952
  35. 97
  36. 797
  37. 659
  38. 243
  39. 994
  40. 116

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