What is a fraction of a fraction?

A fraction of a fraction is yet another (usually smaller) fraction.

For example 1/4 of 1/3 = (1x1) / (4x3) = 1/12

Only when both or one of the fractions is an "improper" fraction (larger than 1) does the multiplication give a result that is larger than the beginning fractions.

For example : 7/4 x 3/5 = 21/20 = 1 1/20