A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the required decimal representation is 251, exactly as in the question.
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It is 251 and there is no requirement for a decimal point.
Note that 251 is the same as 251.0. Move 2 decimal places to the left to get: 2.51 x 102
11111 - 11111011 = −11011100 or converted to decimal 31 - 251 = −220
This is called a decimal fraction, and it can also be written as a mixed fraction: 254/100 or, in lowest terms, 251/25.
251 = 251/1