## Submitted by Howard, from Portland, OR, who is not affiliated with the site.

What started out as Sal Kahn making a few algebra videos for his cousins has grown to over 2,100 videos and exercises and assessments covering everything from arithmetic to physics, finance, and history. While there isn’t a URL for just the math videos, they are easy to navigate to, with the drop down menu. Includes all levels of math from basic arithmetic to calculus.

## Click to visit Kahn Academy

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