2.25 = 10.01 * 2^0 = 0.1001 * 2^2
In un-normalized version , number is represented as (-1)^s 0.M x 2^(E-63)
here M = 1001
Now E-63 = 2 => E = 65.
And, s=1 , since number is Negative.
So the representation would be ,
1 100100000000000000000000 1000001
where s=1
M=100100000000000000000000
and E-63 which is 65 is 1000001,
from extreme right , make groups of 4.
After making groups , one can easily see it is , C8000041