10/27 is non terminating as it has 3^3 as a denominator and 10 at its numerator the even multiples of 5 as for example 2*5,4*5 except those which does not have 3 as its prime facor like 6*5 as it has 3 as a prime factor of 6 and 7/20 si terminating as it has 2*5 at its denominator always resukt to a terminating fraction