Convert all three fractions to a common denominator and compare the numerators to arrange the fractions in order
The quickest, but not always the lowest common denominator, can be found by multiplying the given denominators, in this case
2x3x5 =30 Now convert each fraction to an equivalent fraction with the denominator of 30
(1/2)(15/15) = 15/30
(4/5)(6/6) = 24/30
Looking at the numerators, 24 , 20 and 15 we can quickly see that the highest to lowest arrangement would be; 4/5 , 2/3 and 1/2.