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So, lets say I have a number 123456. 123456 % 97 = 72. How can I determine what two digits need to be added to the end of 123456 such that the new number % 97 = 1? Note–it must always be two digits.
For example, 12345676 % 97 = 1. In this case, I need to add the digits ’76’ to the end of the number.
(This is for IBAN number calculation.)
You calc the modulo of 12345600 to 97 and add (97 – that + 1) to that number. So you get what RoBorg explained whay cleaner above 🙂