1/18. It IS a fraction. Just in words.
18/24 of a day.
It is 18/25.
you put the number over one EX: 9/1 18/1
18.5 = 36/2 (representing the 18) + 1/2 = 37/2. I believe this is an improper fraction.
It is 18/10 cm as an improper fraction. It can be simplified, if required and you could convert it to a mixed number.
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To convert a percentage to a vulgar fraction, put it over 100 and simplify: 72 % = 72/100 = 18/25