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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 68 · 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 school has 409 children. 336 of them are girls. How many boys are there?
  2. 2.A school has 831 children. 821 of them are girls. How many boys are there?
  3. 3.? + 313 = 605
  4. 4.470 − 278 =
  5. 5.? + 674 = 870
  6. 6.A school has 766 children. 660 of them are girls. How many boys are there?
  7. 7.A train has 880 people in the front coaches and 112 people in the back coaches. How many people are on the train?
  8. 8.A school has 685 children. 574 of them are girls. How many boys are there?
  9. 9.? + 472 = 913
  10. 10.A train has 640 people in the front coaches and 356 people in the back coaches. How many people are on the train?
  11. 11.596 − 262 =
  12. 12.117 + ? = 967
  13. 13.542 + 192 =
  14. 14.249 − ? = 117
  15. 15.754 + ? = 881
  16. 16.783 + ? = 954
  17. 17.841 − 638 =
  18. 18.A school has 588 children. 368 of them are girls. How many boys are there?
  19. 19.613 − 276 =
  20. 20.A school has 287 children. 218 of them are girls. How many boys are there?
  21. 21.? − 183 = 295
  22. 22.A school has 653 children. 176 of them are girls. How many boys are there?
  23. 23.925 − 101 =
  24. 24.A school has 448 children. 232 of them are girls. How many boys are there?
  25. 25.A train has 858 people in the front coaches and 113 people in the back coaches. How many people are on the train?
  26. 26.775 − 135 =
  27. 27.? − 462 = 125
  28. 28.A train has 321 people in the front coaches and 637 people in the back coaches. How many people are on the train?
  29. 29.430 + ? = 933
  30. 30.? − 376 = 231
  31. 31.844 − ? = 480
  32. 32.198 + ? = 554
  33. 33.543 − ? = 33
  34. 34.? + 418 = 712
  35. 35.950 − 738 =
  36. 36.626 + ? = 955
  37. 37.? − 204 = 536
  38. 38.722 + ? = 975
  39. 39.? + 824 = 924
  40. 40.A train has 837 people in the front coaches and 147 people in the back coaches. How many people are on the train?

Answer key

  1. 73
  2. 10
  3. 292
  4. 192
  5. 196
  6. 106
  7. 992
  8. 111
  9. 441
  10. 996
  11. 334
  12. 850
  13. 734
  14. 132
  15. 127
  16. 171
  17. 203
  18. 220
  19. 337
  20. 69
  21. 478
  22. 477
  23. 824
  24. 216
  25. 971
  26. 640
  27. 587
  28. 958
  29. 503
  30. 607
  31. 364
  32. 356
  33. 510
  34. 294
  35. 212
  36. 329
  37. 740
  38. 253
  39. 100
  40. 984

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