Question

How to subtract hexadecimal number when one is bigger than the other?

Answer 1

Hello,

In order to be simple: let's code hexadecimal numbers on 4 digits.

Example: 500-200=300 (in décimal)

$500_{10}=01F4_{16}\\\\ 200_{10}=00C8_{16}\\\\ For\ subtract\ 00C8\ we\ calculate\ 15th\ complement\\\\ C_{15}(00C8)=FF37\\\\ 16th\ complement= FF37+0001=FF38\\\\ Then\ we\ add\\\\ 01F4+FF38=(1)012C\ on\4\ digits:\ 012C\\ 012C_{16}=300_{16}$