Listing the fractions is ascending (or descending) order.
think of it as money. you could do that with decimals too.
5/8,5/6,2/3
All you have to do is convert either the fractions to decimals or the decimals to fractions. If you do not know lets say what one sixth is, just divide 6 by 100 on a calculator and round it....
you have to cross multiply of coarse!.