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 installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to solve an equation in which to rational expressions are said to equal each other.
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How To: Use ">" (greater than) and "<" (less than) symbols

How To: Do long division without a calculator

How To: Calculate percent composition for chemistry

How To: Solve problems involving functions in algebra

How To: Find the Radius of a Circle from Arc Length

How To: Convert between diameter and radius

How To: Multiply & Divide Numbers (Basic Elementary Math)

How To: Use a TI89 calculator to graph linear equations

How To: Solve integers and rational numbers

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How To: Find the area of a triangle when given 2 sides & angle

How To: Prove a triangle inscribed in a circle is right angled
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