Open the calculator on your iPhone. Press "mc" and "c" to zero out the calculator's memory and display. Calculate the fractional portion of the first mixed fraction 3 5/8, which is 5/8.

How to Divide Fractions on the Google Calculator. Google Calculator is an online tool offered by Google that lets you use its website to do basic math calculations such as addition and subtraction.

Gary Lineker uses football-related examples to demonstrate how to work out ratios.