Would you like to make this site your homepage? It's fast and easy...
Yes, Please make this my home page!
Don't show this to me again.
(International Standard Book Number) is a unique number assigned to each book.
The number has 9 information digits and ends with 1 check digit.
Assuming the digits are "abcdefghi-j" where j is the check digit. Then the check digit is computed by the following formula:
j = [a b c d e f g h i] * [1 2 3 4 5 6 7 8 9]' (mod 11)
Please input a string with 9 digits: