Barrack gives it a thumbs up
With Barack away and done with...
If I had the binary code 11101001, you would split them into two, 1110 & 1001 and find their amounts, so in this case it would be 214 and 9, now we would add these together witch would bring us to 223, now we divide by 16 and get the answer of DF.
D being equal to 13 and F to 15. This is entirely because of the remaining awesome known as 13 x 16 = 208 + 15 = 223, the important number here is 15, this is the difference between 223 and 208.