Want to know how to find percentages quickly without the use of a calculator? It's easy. This free video math lesson will show you how it's done. From Ramanujan to calculus cocreator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just study for that next big test).
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How To: Do long division without a calculator

How To: Divide small numbers by big numbers

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How To: Convert between diameter and radius

How To: Calculate percent composition for chemistry

How To: Find extra points for a parabola (quadractic equation)

How To: Find the formula of a piecewise function given a graph

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