You need to first convert everything to a simple fraction, like 4/7, 3/5, etc.

After that just multiply the tops and bottoms separately.

Example:

3 3/4 x 3 3/4

Convert 3 3/4 to a simple fraction first

3 3/4 = 3 + 3/4 (same thing. think about measuring water in a cup. you would add 3 cups PLUS 3/4 of a cup). In order to add the fractions, you need to make them both have the same bottom part, so multiply the 3, which is really 3/1 too, by 4 on the top and bottom

3/1 = 4x3/4x1 = 12/4

12/4 + 3/4 = 15/4

A shortcut to doing this conversion is to just multiply the bottom number of the mixed fraction '4' in 3 3/4 by the whole number on the far left ('3') and add it to the top part of the fraction. 4x3 + 3 = 15. You then put it all over the bottom part, so 15/4.

Once you have 2 regular fractions, just add them up.

15/4 + 15/4 = 30/4 = 7 1/2

First turn the whole number into a fraction by putting a zero under it

Then multiply the tops with the tops and the bottom number with the bottom number