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The binary number 11.1 in decimal would be 3.5
11.25 is not a valid binary.
The binary equivalent of the decimal number 63 is 111111.
You can easily convert decimal to binary in the scientific calculator - for example, the scientific calculator found in Windows. In this case, type the number in decimal, then click on "binary" to convert to binary.
An easy way is to convert them to decimal, subtract, then convert the answer back to binary.