say i have something like

(2/3)-(1/3)
----------------
3

do i multiply the top this way
(1/3)(3/1) by flipping the denominator or
multiply it like this (1/3)(1/3)

Are you sure it isn't a subtraction problem since there's a minus sign between the two fractions?

2/3 - 1/3 = 1/3
. . . 3

Then you have 1/3 divided by 3
Flip the second number so your problem is:

1/3 * 1/3 = 1/9