0.5 is a half.
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The decimal equivalent for one half (1/2) is 0.5 (1/2 == 5/10 --> 0.5)
A binary decimal is another term for a bicimal, a decimal in base 2. The first digit after a radix point will be equivalent to a half, the second digit equivalent to a quarter, and so on.
Written as a decimal, 9 50/100 (which is equivalent to 9 and a half) is equal to 9.5.
1/2 as a decimal number is written as 0.5 (equivalent to 5/10, which clearly reduces to 1/2)
It represents 0.5 which is equivalent to 1/2 = a half