12.625

12/2 = 6 R0
 6/2 = 3 R0
 3/2 = 1 R1
 1/2 = 0 R1

12: 1100

0.625 * 2 = 1.25
0.25  * 2 = 0.5
0.5   * 2 = 1.0

0.625 = 0.101

12.625: 1100.101


=============   

0.1 * 2 = 0.2
0.2 * 2 = 0.4
0.4 * 2 = 0.8
0.8 * 2 = 1.6
0.6 * 2 = 1.2
0.2 * 2 = 0.4
0.4 * 2 = 0.8
0.8 * 2 = 1.6
0.6 * 2 = 1.2

0.0001100110011001100110011001100110011