Here students can learn math ranging from 1+1=2 all the way through Calculus. If they need help they can watch a video or get a hint. You can keep an eye on them as their Coach. There are also videos for most other subjects, just click watch.
This is a very interesting article about using technology to provide additional instruction as well as looking at possibly flipping the classroom structure. The article shares both pros and cons of Khan Academy and not associated with a school district.