Multiplying fractions is easy:
just multiply the numerators, and multiply the denominators.
(Some people refer to this as multiplying across.)
That is:
$\displaystyle\frac{A}{B}\cdot\frac{C}{D} = \frac{AC}{BD}$
Every division problem is a multiplication problem in disguise:
to divide by a number means to multiply by its reciprocal.
That is,
$\,x\,$ divided by
$\,y\,$
is the same as
$\,x\,$ times the reciprocal of
$\,y\,$.
In symbols:
$\displaystyle
\cssId{s16}{x\div y}
\cssId{s17}{= \frac{x}{y}}
\cssId{s18}{= x\cdot \frac{1}{y}}$
Here's what it looks like with fractions:
$\displaystyle
\cssId{s20}{\frac{A}{B}\div\frac{C}{D}}
\cssId{s21}{= \frac{A}{B}\cdot\frac{D}{C}}
\cssId{s22}{= \frac{AD}{BC}}$
Where needed, input your answer as a diagonal fraction (like “2/5”),
since you can't input horizontal fractions.
Answers do not need to be in simplest form.