How do you convert binary numbers to hexadecimal?

Arrange your binary number in Four number groups from right to left add zero's if needed.

So if your binary is 11011101 it will be 1101 1101

now replace your group with

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

and you get your number in hex

1101 1101 == DD