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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 195 · 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. 1.251 + 717 =
  2. 2.398 − 371 =
  3. 3.668 + 229 =
  4. 4.A train has 694 people in the front coaches and 237 people in the back coaches. How many people are on the train?
  5. 5.252 − ? = 11
  6. 6.331 + 304 =
  7. 7.A school has 969 children. 101 of them are girls. How many boys are there?
  8. 8.988 − 974 =
  9. 9.? + 378 = 647
  10. 10.529 − 397 =
  11. 11.584 + 401 =
  12. 12.311 − 216 =
  13. 13.? − 379 = 469
  14. 14.781 + 148 =
  15. 15.? + 823 = 978
  16. 16.A train has 173 people in the front coaches and 268 people in the back coaches. How many people are on the train?
  17. 17.442 − ? = 334
  18. 18.403 + ? = 589
  19. 19.267 − 178 =
  20. 20.A train has 836 people in the front coaches and 160 people in the back coaches. How many people are on the train?
  21. 21.793 + 158 =
  22. 22.830 + 106 =
  23. 23.? − 680 = 195
  24. 24.676 − 358 =
  25. 25.A train has 557 people in the front coaches and 409 people in the back coaches. How many people are on the train?
  26. 26.161 + 785 =
  27. 27.? + 128 = 474
  28. 28.? + 105 = 914
  29. 29.A school has 552 children. 202 of them are girls. How many boys are there?
  30. 30.? + 877 = 990
  31. 31.561 + 401 =
  32. 32.207 − 174 =
  33. 33.824 − ? = 717
  34. 34.501 + ? = 831
  35. 35.273 − ? = 90
  36. 36.A school has 494 children. 444 of them are girls. How many boys are there?
  37. 37.900 − ? = 770
  38. 38.A school has 586 children. 532 of them are girls. How many boys are there?
  39. 39.A train has 886 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  40. 40.? + 539 = 922

Answer key

  1. 968
  2. 27
  3. 897
  4. 931
  5. 241
  6. 635
  7. 868
  8. 14
  9. 269
  10. 132
  11. 985
  12. 95
  13. 848
  14. 929
  15. 155
  16. 441
  17. 108
  18. 186
  19. 89
  20. 996
  21. 951
  22. 936
  23. 875
  24. 318
  25. 966
  26. 946
  27. 346
  28. 809
  29. 350
  30. 113
  31. 962
  32. 33
  33. 107
  34. 330
  35. 183
  36. 50
  37. 130
  38. 54
  39. 994
  40. 383

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