It's 1010
You round the 10.25 down to 10, so it's the same as it would be for 10.
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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.
11