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). With this twopart installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to simplify rational expressions in algebra.
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How To: Find a number given Its percent

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Calculate the area of a parallelogram

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How To: Do long division without a calculator

How To: Find the area of a parallelogram using geometry

How To: Find a missing side of a triangle, similar to another

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How To: Figure out the domain & range of a piecewise function

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