Binary subtraction is also similar to that of decimal subtraction with
the difference that when 1 is subtracted from 0, it is necessary to borrow 1
from the next higher order bit and that bit is reduced by 1 (or 1 is added to
the next bit of subtrahend) and the remainder is 1.
Thus the rules of binary subtraction are as follows:
0  0 = 0 1  0 = 1 1  1 = 0 0  1 = 1 with a borrow of 1

Binary Subtraction Table

For fractional numbers, the rules of subtraction are the same with the binary point properly placed.
A clear concept on few examples will make the procedure of binary subtraction:
Subtract the following numbers:
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