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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 99 · 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.? + 195 = 577
  2. 2.A school has 235 children. 231 of them are girls. How many boys are there?
  3. 3.A train has 196 people in the front coaches and 759 people in the back coaches. How many people are on the train?
  4. 4.A train has 793 people in the front coaches and 189 people in the back coaches. How many people are on the train?
  5. 5.785 + 183 =
  6. 6.435 − ? = 152
  7. 7.A train has 271 people in the front coaches and 395 people in the back coaches. How many people are on the train?
  8. 8.A train has 498 people in the front coaches and 343 people in the back coaches. How many people are on the train?
  9. 9.878 − 718 =
  10. 10.166 + 827 =
  11. 11.670 + 153 =
  12. 12.A school has 861 children. 647 of them are girls. How many boys are there?
  13. 13.796 + 108 =
  14. 14.? + 329 = 767
  15. 15.460 + 101 =
  16. 16.? − 165 = 78
  17. 17.A school has 594 children. 322 of them are girls. How many boys are there?
  18. 18.? − 710 = 134
  19. 19.480 − ? = 5
  20. 20.? − 153 = 553
  21. 21.489 + 245 =
  22. 22.A school has 617 children. 614 of them are girls. How many boys are there?
  23. 23.A train has 725 people in the front coaches and 116 people in the back coaches. How many people are on the train?
  24. 24.307 + 237 =
  25. 25.544 − ? = 436
  26. 26.427 + 422 =
  27. 27.579 + 157 =
  28. 28.A train has 817 people in the front coaches and 181 people in the back coaches. How many people are on the train?
  29. 29.897 + ? = 997
  30. 30.A train has 303 people in the front coaches and 190 people in the back coaches. How many people are on the train?
  31. 31.537 + 123 =
  32. 32.308 − ? = 179
  33. 33.675 − 236 =
  34. 34.726 − ? = 272
  35. 35.278 − 185 =
  36. 36.240 − 196 =
  37. 37.854 − ? = 465
  38. 38.A school has 220 children. 161 of them are girls. How many boys are there?
  39. 39.186 + ? = 969
  40. 40.765 − 354 =

Answer key

  1. 382
  2. 4
  3. 955
  4. 982
  5. 968
  6. 283
  7. 666
  8. 841
  9. 160
  10. 993
  11. 823
  12. 214
  13. 904
  14. 438
  15. 561
  16. 243
  17. 272
  18. 844
  19. 475
  20. 706
  21. 734
  22. 3
  23. 841
  24. 544
  25. 108
  26. 849
  27. 736
  28. 998
  29. 100
  30. 493
  31. 660
  32. 129
  33. 439
  34. 454
  35. 93
  36. 44
  37. 389
  38. 59
  39. 783
  40. 411

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