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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 366 · 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. 1.534 − 363 =
  2. 2.238 + 181 =
  3. 3.465 − 183 =
  4. 4.624 + 128 =
  5. 5.846 − 526 =
  6. 6.458 − 102 =
  7. 7.A train has 208 people in the front coaches and 509 people in the back coaches. How many people are on the train?
  8. 8.340 + ? = 523
  9. 9.381 + 455 =
  10. 10.709 − 698 =
  11. 11.333 − 277 =
  12. 12.A school has 261 children. 114 of them are girls. How many boys are there?
  13. 13.A train has 124 people in the front coaches and 331 people in the back coaches. How many people are on the train?
  14. 14.176 + 701 =
  15. 15.A train has 170 people in the front coaches and 499 people in the back coaches. How many people are on the train?
  16. 16.864 + 101 =
  17. 17.A train has 114 people in the front coaches and 645 people in the back coaches. How many people are on the train?
  18. 18.330 − ? = 198
  19. 19.939 − 829 =
  20. 20.A school has 848 children. 772 of them are girls. How many boys are there?
  21. 21.759 − 279 =
  22. 22.? − 207 = 462
  23. 23.? − 302 = 54
  24. 24.? − 578 = 3
  25. 25.300 + 106 =
  26. 26.? − 284 = 365
  27. 27.A train has 668 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  28. 28.794 + 184 =
  29. 29.A train has 715 people in the front coaches and 139 people in the back coaches. How many people are on the train?
  30. 30.750 − 648 =
  31. 31.178 + 329 =
  32. 32.? − 187 = 63
  33. 33.A school has 887 children. 351 of them are girls. How many boys are there?
  34. 34.A school has 330 children. 195 of them are girls. How many boys are there?
  35. 35.A school has 280 children. 260 of them are girls. How many boys are there?
  36. 36.320 − ? = 89
  37. 37.? − 294 = 12
  38. 38.368 − 129 =
  39. 39.896 − 835 =
  40. 40.343 − 338 =

Answer key

  1. 171
  2. 419
  3. 282
  4. 752
  5. 320
  6. 356
  7. 717
  8. 183
  9. 836
  10. 11
  11. 56
  12. 147
  13. 455
  14. 877
  15. 669
  16. 965
  17. 759
  18. 132
  19. 110
  20. 76
  21. 480
  22. 669
  23. 356
  24. 581
  25. 406
  26. 649
  27. 770
  28. 978
  29. 854
  30. 102
  31. 507
  32. 250
  33. 536
  34. 135
  35. 20
  36. 231
  37. 306
  38. 239
  39. 61
  40. 5

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