In this Khan Academy video, Sal uses a visual model to explain why we multiply fractions as top times top, bottom times bottom. Duration: 5:05.

Here, The Organic Chemistry Tutor walks us through a number of fraction multiplication problems. Duration: 10:39

Mr. J is here to visually demonstrate why we divide two fractions by multiplying by a reciprocal. This geometric demonstration is different from the algebra demonstration we used in class. Duration: 6:20

The demonstration presented by Jill Rumbaugh in the next video closely matches the algebraic explanation we used in class. Of course, Jill just says that whatever we do to the top we have to do to the bottom without referencing a "Fancy One." Duration: 5:05

Here we once again enlist the help of The Organic Chemistry Tutor to guide us through a number of fraction division problems using the "keep, change, flip" method. Duration: 10:25

In this Khan Academy video, Sal uses a geometric model to demonstrate adding fractions by getting a common denominator. Duration: 5:39

Watch as The Organic Chemistry Tutor takes us through a number of problems involving adding two fractions by getting a common denominator. Duration: 11:15

This final video once again tasks The Organic Chemistry Tutor with subtracting a number of fractions by getting a common denominator. Duration: 11:21