"of" means "times"


First we reduce the
to
Now we have


Now we change the mixed number
to an
improper fraction by multplying the denominator
by the whole part
, getting
, adding the
numerator,
getting
and putting that over the denominator
, getting
So now we have


Now multuply the two numerators 

getting
Then multiply the two denominators 

getting
Now put the
over the
.
Now we have
That is the improper fraction form of the answer. To get that
to a mixed number,
Divide the denominator
into the numerator
4
4)19
16
3
Write the quotient
Put the remainder
over the divisor
,
getting
and write that beside the
,
and the final answer is
Edwin