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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 255 · 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 791 people in the front coaches and 130 people in the back coaches. How many people are on the train?
  2. 2.? − 263 = 336
  3. 3.450 + 290 =
  4. 4.? − 704 = 23
  5. 5.274 + 440 =
  6. 6.393 + 529 =
  7. 7.? + 855 = 998
  8. 8.? − 744 = 181
  9. 9.A school has 391 children. 230 of them are girls. How many boys are there?
  10. 10.? − 213 = 240
  11. 11.622 − 353 =
  12. 12.357 − 337 =
  13. 13.A school has 503 children. 381 of them are girls. How many boys are there?
  14. 14.128 + 630 =
  15. 15.780 + 182 =
  16. 16.194 + ? = 727
  17. 17.806 + ? = 912
  18. 18.A train has 150 people in the front coaches and 235 people in the back coaches. How many people are on the train?
  19. 19.A train has 321 people in the front coaches and 212 people in the back coaches. How many people are on the train?
  20. 20.A train has 293 people in the front coaches and 480 people in the back coaches. How many people are on the train?
  21. 21.522 − 338 =
  22. 22.597 − 486 =
  23. 23.177 + 784 =
  24. 24.A school has 862 children. 672 of them are girls. How many boys are there?
  25. 25.207 − 127 =
  26. 26.A train has 403 people in the front coaches and 202 people in the back coaches. How many people are on the train?
  27. 27.? − 153 = 63
  28. 28.A school has 258 children. 225 of them are girls. How many boys are there?
  29. 29.A train has 825 people in the front coaches and 103 people in the back coaches. How many people are on the train?
  30. 30.588 + ? = 753
  31. 31.802 − 142 =
  32. 32.A school has 613 children. 405 of them are girls. How many boys are there?
  33. 33.A school has 695 children. 525 of them are girls. How many boys are there?
  34. 34.478 + 297 =
  35. 35.879 + 103 =
  36. 36.304 + ? = 686
  37. 37.669 − ? = 280
  38. 38.A school has 233 children. 163 of them are girls. How many boys are there?
  39. 39.A train has 846 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  40. 40.793 − ? = 234

Answer key

  1. 921
  2. 599
  3. 740
  4. 727
  5. 714
  6. 922
  7. 143
  8. 925
  9. 161
  10. 453
  11. 269
  12. 20
  13. 122
  14. 758
  15. 962
  16. 533
  17. 106
  18. 385
  19. 533
  20. 773
  21. 184
  22. 111
  23. 961
  24. 190
  25. 80
  26. 605
  27. 216
  28. 33
  29. 928
  30. 165
  31. 660
  32. 208
  33. 170
  34. 775
  35. 982
  36. 382
  37. 389
  38. 70
  39. 967
  40. 559

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