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Khan Academy

The site famously features K-12 video tutorials created by Sal Khan and the team.

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It currently gives learners access to thousands of video tutorials that explain the ins and outs of geometry, algebra, trigonometry, calculus, statistics, finance, physics, economics, and more. Videos can also be accessed via YouTube and iTunesU or on the Khan Academy’s website.

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Android, iOS, Web-based
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No Credit Card Required
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