there are several ways, 11/2 would be the main one though.
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1/2
1/2 1:2 .5 one half One half, 0.5, 1/2, 50%.
One and a half meter is written as 1 1/2 meters or 1.5 meters.
1/2 of 1/100 = 1/200
To write seven and a half hours, you can express it as 7.5 hours or as 7 hours and 30 minutes. This is a decimal representation of time where the whole number represents the hours and the decimal represents the fraction of an hour in terms of minutes. It is a common way to express time in a more precise and standardized format.