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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 29 · 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.? + 897 = 998
  2. 2.? − 651 = 269
  3. 3.A school has 827 children. 314 of them are girls. How many boys are there?
  4. 4.882 + 116 =
  5. 5.? − 122 = 509
  6. 6.? + 347 = 630
  7. 7.A train has 798 people in the front coaches and 169 people in the back coaches. How many people are on the train?
  8. 8.? + 150 = 361
  9. 9.486 + 147 =
  10. 10.177 + 127 =
  11. 11.358 + ? = 462
  12. 12.408 − 124 =
  13. 13.993 − 362 =
  14. 14.? − 262 = 694
  15. 15.653 − 140 =
  16. 16.A school has 572 children. 306 of them are girls. How many boys are there?
  17. 17.A train has 648 people in the front coaches and 146 people in the back coaches. How many people are on the train?
  18. 18.? − 228 = 167
  19. 19.863 − 166 =
  20. 20.937 − ? = 528
  21. 21.? + 219 = 700
  22. 22.845 + 134 =
  23. 23.248 − 194 =
  24. 24.769 + 166 =
  25. 25.? + 731 = 929
  26. 26.A train has 156 people in the front coaches and 497 people in the back coaches. How many people are on the train?
  27. 27.A school has 271 children. 180 of them are girls. How many boys are there?
  28. 28.A train has 630 people in the front coaches and 294 people in the back coaches. How many people are on the train?
  29. 29.230 + 207 =
  30. 30.A train has 133 people in the front coaches and 652 people in the back coaches. How many people are on the train?
  31. 31.119 + ? = 376
  32. 32.110 + ? = 777
  33. 33.? + 879 = 995
  34. 34.113 + ? = 652
  35. 35.A train has 896 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  36. 36.364 − ? = 45
  37. 37.775 + 186 =
  38. 38.? + 714 = 890
  39. 39.222 + 760 =
  40. 40.? + 622 = 971

Answer key

  1. 101
  2. 920
  3. 513
  4. 998
  5. 631
  6. 283
  7. 967
  8. 211
  9. 633
  10. 304
  11. 104
  12. 284
  13. 631
  14. 956
  15. 513
  16. 266
  17. 794
  18. 395
  19. 697
  20. 409
  21. 481
  22. 979
  23. 54
  24. 935
  25. 198
  26. 653
  27. 91
  28. 924
  29. 437
  30. 785
  31. 257
  32. 667
  33. 116
  34. 539
  35. 998
  36. 319
  37. 961
  38. 176
  39. 982
  40. 349

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