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# International Standard Book Numbers

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## jawahar syed

on 1 October 2012

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#### Transcript of International Standard Book Numbers

By Jawahar Syeda
Andrea Rivas
Kerita De Boer The International Standard Book
Numbers (ISBN) Lets Calculate.. Using X? Sometimes the only choice for a check number will be 10. Since this is
a two digit number and cannot be used as such, the Roman numeral 10,
the symbol X, is used. Conclusion What are ISBN Numbers? The ISBN is a unique numeric commercial book identifier based upon 9-digit standard book numbering code created by Gordon Foster. Here is an ISBN number
0-205-12669-3 0 indicates the book is written in English, 205 indicates the publisher
and 12669 indicates book published by the publisher. The last digit is chosen in following way.. Each digit is given a weight by using digits from 1-10 and counting left to right, then these weights are added. 0 (10) + 2 (9) + 0 (8) + 5 (7) + 1 (6)+ 2 (5) + 6 (4) + 6 (3) + 9 (2) + ___ (1) The check digit is chosen to be a number from 0 to 10 so that this weighted sum is a multiple of 11. That is, the sum must be divisible by 11. = 0 + 18 + 0 + 35 + 6 + 10 + 24 + 18 + 18
= 129 The check digit 3 was chosen because 129 + 3(1) = 132 and 132 is a multiple of 11. 129 is greater than 11(11) = 121 and 14 less than 11(13) = 143. The only possible number from 0 to 10 to use as a check digit is 3. Bibliography This system for assigning the last
number of an ISBN number makes it
possible to detect errors made by
writing a single digit incorrectly or
by writing a pair of digits in the
wrong order, since we know what
each number indicates. mathforum.org