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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 951 · 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. 1.457 + ? = 655
  2. 2.585 − 483 =
  3. 3.A school has 892 children. 287 of them are girls. How many boys are there?
  4. 4.? + 417 = 771
  5. 5.907 − ? = 482
  6. 6.? − 771 = 23
  7. 7.A school has 300 children. 217 of them are girls. How many boys are there?
  8. 8.427 − ? = 119
  9. 9.861 − ? = 410
  10. 10.357 − ? = 105
  11. 11.691 − 178 =
  12. 12.677 − 663 =
  13. 13.128 + 825 =
  14. 14.A school has 868 children. 563 of them are girls. How many boys are there?
  15. 15.137 + ? = 946
  16. 16.227 + 733 =
  17. 17.656 − 299 =
  18. 18.A train has 872 people in the front coaches and 119 people in the back coaches. How many people are on the train?
  19. 19.? + 894 = 994
  20. 20.605 − 446 =
  21. 21.A school has 650 children. 107 of them are girls. How many boys are there?
  22. 22.A school has 887 children. 338 of them are girls. How many boys are there?
  23. 23.329 − ? = 49
  24. 24.310 − ? = 67
  25. 25.850 + 113 =
  26. 26.623 + 123 =
  27. 27.835 + 141 =
  28. 28.A train has 149 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  29. 29.557 − 279 =
  30. 30.860 + ? = 994
  31. 31.? + 828 = 956
  32. 32.261 − 206 =
  33. 33.A school has 345 children. 315 of them are girls. How many boys are there?
  34. 34.358 − ? = 95
  35. 35.A train has 124 people in the front coaches and 864 people in the back coaches. How many people are on the train?
  36. 36.415 + 214 =
  37. 37.A school has 275 children. 200 of them are girls. How many boys are there?
  38. 38.? − 165 = 749
  39. 39.161 + 185 =
  40. 40.645 + ? = 755

Answer key

  1. 198
  2. 102
  3. 605
  4. 354
  5. 425
  6. 794
  7. 83
  8. 308
  9. 451
  10. 252
  11. 513
  12. 14
  13. 953
  14. 305
  15. 809
  16. 960
  17. 357
  18. 991
  19. 100
  20. 159
  21. 543
  22. 549
  23. 280
  24. 243
  25. 963
  26. 746
  27. 976
  28. 250
  29. 278
  30. 134
  31. 128
  32. 55
  33. 30
  34. 263
  35. 988
  36. 629
  37. 75
  38. 914
  39. 346
  40. 110

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