Quilt University offers a class called Math for Quilters that is one of their most popular classes. It's taught by Dena Crain who is an excellent teacher - I've had her for other classes.
The Math class is next offered starting April 27th and covers all sorts of things that are frequently asked here on the board...planning a cutting layout, on point quilts, drafting blocks in different sizes, figuring yardage requirements, calculating the cost of a quilt, setting a price for it.
Info on this and other QU classes at
http://www.quiltuniversity.com/catalog.htm