Real Setting213eqdkanfkleoajsmcknam.pptx

Real setting application

1. Application of Congruence in Real Setting

2. International Standard Book Number A product identifier used by publishers, libraries, booksellers, internet retailers and other supply chain participants for ordering, listing, sales record and stock control purposes Identifies the registrant, as well as the specific title, edition and format Consists of 13 digits

3. Determine the ISBN check digit x of the book, Hiyas sa Pagbasa by: Lydia P. Lalunio , Ph.D. Francisca G. Ril

4. The 13 digits are 978-971-0422-98-2 FORMULA

5. Correct ISBN: 978-971-0422-98-2 Incorrect ISBN: 978-971-4022-98-2 Solution: =10-(9+3(7)+8+3(9)+7+3(1)+4+3(0)+2+3(2)+9+3(8)) mod 10 =10-120 mod 10 =10-0 =10 Because the check digit is 10 and not 2 as it should be, then the ISBN is incorrect.