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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 902 · 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. 1.569 − ? = 446
  2. 2.A school has 927 children. 279 of them are girls. How many boys are there?
  3. 3.A school has 338 children. 106 of them are girls. How many boys are there?
  4. 4.123 + 230 =
  5. 5.? − 440 = 545
  6. 6.? + 762 = 965
  7. 7.? − 615 = 39
  8. 8.699 + 104 =
  9. 9.A train has 843 people in the front coaches and 111 people in the back coaches. How many people are on the train?
  10. 10.? − 152 = 117
  11. 11.A train has 523 people in the front coaches and 210 people in the back coaches. How many people are on the train?
  12. 12.619 + 274 =
  13. 13.229 + 504 =
  14. 14.? + 254 = 814
  15. 15.257 − 226 =
  16. 16.582 + 361 =
  17. 17.A school has 410 children. 313 of them are girls. How many boys are there?
  18. 18.133 + 762 =
  19. 19.A train has 237 people in the front coaches and 201 people in the back coaches. How many people are on the train?
  20. 20.? − 256 = 82
  21. 21.429 − ? = 170
  22. 22.551 + ? = 915
  23. 23.144 + 194 =
  24. 24.871 − ? = 701
  25. 25.A school has 927 children. 615 of them are girls. How many boys are there?
  26. 26.A school has 694 children. 485 of them are girls. How many boys are there?
  27. 27.785 + 186 =
  28. 28.? − 140 = 467
  29. 29.295 − ? = 18
  30. 30.A school has 813 children. 777 of them are girls. How many boys are there?
  31. 31.A train has 778 people in the front coaches and 148 people in the back coaches. How many people are on the train?
  32. 32.919 − 566 =
  33. 33.729 − ? = 622
  34. 34.446 − 184 =
  35. 35.866 + ? = 991
  36. 36.444 − ? = 17
  37. 37.A school has 738 children. 186 of them are girls. How many boys are there?
  38. 38.257 − 168 =
  39. 39.100 + ? = 402
  40. 40.? + 653 = 860

Answer key

  1. 123
  2. 648
  3. 232
  4. 353
  5. 985
  6. 203
  7. 654
  8. 803
  9. 954
  10. 269
  11. 733
  12. 893
  13. 733
  14. 560
  15. 31
  16. 943
  17. 97
  18. 895
  19. 438
  20. 338
  21. 259
  22. 364
  23. 338
  24. 170
  25. 312
  26. 209
  27. 971
  28. 607
  29. 277
  30. 36
  31. 926
  32. 353
  33. 107
  34. 262
  35. 125
  36. 427
  37. 552
  38. 89
  39. 302
  40. 207

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