ISBN Check digit
A ISBN is used to make sure a book code is legal. It is worked out and the check digit is the final digit of the 13 digit combination that makes up the ISBN Code. Here I have an example of my Excel spread sheet that can be used to easily find the check digit and 13 digit code from the first 12 digits. simply input the digits in and it produces the full code at the bottom in orange. You will notice the check digit is in the 13th number column.
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