Question

Why is it easy to convert from binary to hexadecimal and vice versa?

Answer 1

Hexadecimal     Binary
    0           0000
    1           0001
    2           0010
    3           0011
    4           0100
    5           0101
    6           0110
    7           0111
    8           1000
    9           1001
    A           1010
    B           1011
    C           1100
    D           1101
    E           1110
    F           1111

We can convert from Hexadecimal to Binary and from Binary to Hexadecimal using this table
each 4 bits of Binary can be converted to one Hexadecimal symbol.
and each one symbol of Hexadecimal symbol can be converted to 4 bits of Binary.
no further calculations are required.

for example A97 can be converted to 1010 1001 0111
and 1111 1000 0101 can be converted to F85