Question 1190195
<pre>
To convert from hexadecimal, replace each individual hex 
digit with its 4-digit binary equivalent. Print this chart:

{{{0[decimal]}}}{{{""=""}}}{{{0[hex]}}}{{{""=""}}}{{{0000[binary]}}}
{{{1[decimal]}}}{{{""=""}}}{{{1[hex]}}}{{{""=""}}}{{{0001[binary]}}}
{{{2[decimal]}}}{{{""=""}}}{{{2[hex]}}}{{{""=""}}}{{{0010[binary]}}}
{{{3[decimal]}}}{{{""=""}}}{{{3[hex]}}}{{{""=""}}}{{{0011[binary]}}}
{{{4[decimal]}}}{{{""=""}}}{{{4[hex]}}}{{{""=""}}}{{{0100[binary]}}}
{{{5[decimal]}}}{{{""=""}}}{{{5[hex]}}}{{{""=""}}}{{{0101[binary]}}}
{{{6[decimal]}}}{{{""=""}}}{{{6[hex]}}}{{{""=""}}}{{{0110[binary]}}}
{{{7[decimal]}}}{{{""=""}}}{{{7[hex]}}}{{{""=""}}}{{{0111[binary]}}}
{{{8[decimal]}}}{{{""=""}}}{{{8[hex]}}}{{{""=""}}}{{{1000[binary]}}}
{{{9[decimal]}}}{{{""=""}}}{{{9[hex]}}}{{{""=""}}}{{{1001[binary]}}}
{{{10[decimal]}}}{{{""=""}}}{{{A[hex]}}}{{{""=""}}}{{{1010[binary]}}}
{{{11[decimal]}}}{{{""=""}}}{{{B[hex]}}}{{{""=""}}}{{{1011[binary]}}}
{{{12[decimal]}}}{{{""=""}}}{{{C[hex]}}}{{{""=""}}}{{{1100[binary]}}}
{{{13[decimal]}}}{{{""=""}}}{{{D[hex]}}}{{{""=""}}}{{{1101[binary]}}}
{{{14[decimal]}}}{{{""=""}}}{{{E[hex]}}}{{{""=""}}}{{{1110[binary]}}}
{{{15[decimal]}}}{{{""=""}}}{{{F[hex]}}}{{{""=""}}}{{{1111[binary]}}}

C521 base 16 

To binary

  C    5    2    1
1100 0101 0010 0001

Answer: 1100010100100001

To decimal:

A=10, B=11, C=12, D=13, E=14, F=15

{{{C*16^3+5*16^2+2*16+1}}}
{{{12*16^3+5*16^2+2*16+1}}}
{{{12*4096+5*256+2*16+1}}}
{{{49152+1280+32+1}}}
{{{50465}}}

3ADF base 16

You do 3ADF base 16 yourself.

Edwin</pre>