This PowerPoint lesson was developed to teach Section 9.4 of the Prentice Hall CA Algebra 2 textbook. (I teach simplifying rational expressions as a separate lesson, so this just shows how to multiply and divide.) The lesson has two videos -- one explains multiplying and the other explains division. This makes it a perfect lesson for new teachers, home teachers, or to leave on days when you can't be in the classroom. (I use that time to take roll.)
Common Core Standard
A-REI 7 ... add, subtract, multiply, and divide rational expressions.