Khan Academy is a free on-line program for students that features math how-to videos.  This allows students to review concepts they are struggling with or to advance to new concepts as they are ready.

 

60 Minutes did a feature on Khan Academy.  Go to http://http://www.cbsnews.com/8301-18560_162-57394905/khan-academy-the-future-of-education/?tag=mncol;lst;4

 

To register, you need a Gmail or Facebook account.  Go to http://www.khanacademy.org