ISBN-10/Examples/0-19-853453-1

Example of ISBN-$10$
The book whose ISBN-$10$ code begins:
 * $0$-$19$-$853453$

has a check digit of $1$.

Proof
The check digit $d$ of an ISBN-$10$ is calculated by definition as:


 * $d = \ds \sum_{k \mathop = 1}^9 k d_k \pmod {11}$

which may or may not need to be translated into $X$ if it equals $10$.

So, we have: