One of Quilt University's most popular classes is Math for Quilters taught by Dena Crain. (I had her for another class and she's terrific.) The next session of the class starts April 27th. It's $27 for a 3 lesson class. It covers everything...even guidance on how to set prices. Here's the supply list and outline.
http://www.quiltuniversity.com/w/MathForQuilters.htm