No dividing the numerator and denominator by the highest common factor of 48 and 64 gives the fraction in simplest form, that is no other factor but 1 divides into the numerator/ denominator
=
when numerator/ denominator are divided by 8
However, dividing numerator/ denominator further by 2 will give simplest form
that is
=
in simplest form
dividing numerator/ denominator by 16 , the highest common factor would have given the fraction in simplest form.