From OP's comment-- "While perhaps “useless” is too strong a claim, I stand by the need for a strong claim here. Khan Academy offers nothing beyond place naming

From OP's comment-- "While perhaps “useless” is too strong a claim, I stand by the need for a strong claim here. Khan Academy offers nothing beyond place naming in its decimal videos. That is unacceptable for a primary instructional resource, and I cannot imagine how it could be helpful as a supplementary resource for a student struggling with decimal concepts." I'm confused. I have never been under the impression that KA was replacing the educational system, but rather, to supplement it and help those that may not understand principles in a different ways, and more broadly, affect some change in an industry that needs it. The tone of the letter kinda sucks, and while its a criticism I can't help but point out that this service is free and has empowered so many-- is the intent to be a one stop shop for everyone to learn? Sure that would be sweet, but come on. All I get from the post is -- 'hey sal, can you create an open dialog to discuss the most effective ways to teach'. What a strange way to do it.