I've looked over my notes for my last lecture only to realise I don't understand what's going on with them at all and would like to know if anyone else can explain how the following works:
8+7 = 10 mod 11
We all know that 8+7 does not equal 10 mod 11, so what's going on?
It then goes on to prove that
7+8 = ?
7+8 = 15, too big so /11, remainder 4
7+8 = 4 mod 11