The final digit of the ISBN is a check digit, so once the 3-digit prefix is added,
the final digit, the check digit, will need to change in order for the "ISBN
formula" that is processed on the 12-digits to equal the new 13th check digit.
the isbn.org site states:
"Two new prefixes are being created. The 978 prefix will be added in front of the
current ISBN-10 and with the addition of a new check digit at the end, the new
ISBN-13 is created.
To convert an ISBN-10 to and ISBN-13, use this Free ISBN Conversion Tool
<http://www.isbn.org/converterpub.asp>.
The new 979 prefix will not be utilized until all 978 pre-fixes have been assigned.
However, 13 digit ISBNs that begin with 979 can never be converted to 10 digit
ISBNs. They have no 10 digit counterpart."
This site also gives an example of a title's 10-digit and 13-digit ISBN:
ISBN-10: 1-56619-909-3
ISBN-13: 978-1-56619-909-4
[note the different final, or check, digit]
Hope this helps.
Denise
*****************************************************************
Denise A. Garofalo
Library Director
Astor Home for Children
6339 Mill Street
PO Box 5005
Rhinebeck, NY 12572
vox 845 871 1013
fax 845 876 2020
dgarofal@astorservices.org
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