You may find hexadecimal easier to understand by watching our video on the subject.
Most people are familiar with decimal because most people have 10 fingers. Instead, let's imagine we have 16 fingers:
Notice that we start counting from 0 instead of 1. So, 0-7 are counted on your left hand and 8-F on your right hand.' When compared to decimal we get:
0(HEX)=0(DEC), 1=1, 2=2, 3=3 [...], 9=9, A=10 , B=11, C=12, D=13, E=14, F=15, 10=16, 11(HEX)=17(DEC), […]
After F, you loop back to 10-17 on your left hand, 18-1F on the right hand. Repeating in loops until you count up to F8, F9, FA, FB, FC, FD, FE, FF, and eventually reach 100 HEX. By converting 100 HEX back to decimal you get 256. e.g. 16(DEC)*16(DEC)=256(DEC).
At first this may seem difficult, but the most important thing to take away from all of this is a rough feeling. The more you do it, the easier it gets. For example, when you wish to turn volume, panning or delay into half of their maximum values: