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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 423 · 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 train has 410 people in the front coaches and 559 people in the back coaches. How many people are on the train?
  2. 2.A school has 693 children. 424 of them are girls. How many boys are there?
  3. 3.437 − 175 =
  4. 4.646 + 138 =
  5. 5.965 − 123 =
  6. 6.A train has 814 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  7. 7.314 − 307 =
  8. 8.? + 405 = 781
  9. 9.557 − 149 =
  10. 10.? + 664 = 788
  11. 11.945 − 353 =
  12. 12.549 − ? = 301
  13. 13.725 − 142 =
  14. 14.A school has 400 children. 110 of them are girls. How many boys are there?
  15. 15.A school has 937 children. 363 of them are girls. How many boys are there?
  16. 16.A train has 657 people in the front coaches and 130 people in the back coaches. How many people are on the train?
  17. 17.A train has 815 people in the front coaches and 177 people in the back coaches. How many people are on the train?
  18. 18.391 − 352 =
  19. 19.A train has 846 people in the front coaches and 127 people in the back coaches. How many people are on the train?
  20. 20.904 − ? = 229
  21. 21.A school has 432 children. 137 of them are girls. How many boys are there?
  22. 22.? + 687 = 897
  23. 23.820 + ? = 988
  24. 24.? − 762 = 27
  25. 25.324 − 120 =
  26. 26.886 + 107 =
  27. 27.371 − ? = 39
  28. 28.A train has 814 people in the front coaches and 183 people in the back coaches. How many people are on the train?
  29. 29.811 − ? = 292
  30. 30.841 − ? = 702
  31. 31.396 − 155 =
  32. 32.358 + 409 =
  33. 33.A train has 853 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  34. 34.A school has 882 children. 879 of them are girls. How many boys are there?
  35. 35.A school has 488 children. 260 of them are girls. How many boys are there?
  36. 36.313 − 254 =
  37. 37.A school has 735 children. 366 of them are girls. How many boys are there?
  38. 38.657 − 630 =
  39. 39.955 − ? = 828
  40. 40.674 + ? = 937

Answer key

  1. 969
  2. 269
  3. 262
  4. 784
  5. 842
  6. 951
  7. 7
  8. 376
  9. 408
  10. 124
  11. 592
  12. 248
  13. 583
  14. 290
  15. 574
  16. 787
  17. 992
  18. 39
  19. 973
  20. 675
  21. 295
  22. 210
  23. 168
  24. 789
  25. 204
  26. 993
  27. 332
  28. 997
  29. 519
  30. 139
  31. 241
  32. 767
  33. 960
  34. 3
  35. 228
  36. 59
  37. 369
  38. 27
  39. 127
  40. 263

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