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 rationalize a denominator.
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How To: Use ">" (greater than) and "<" (less than) symbols

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

How To: Subtract a mixed number from a proper fraction in basic math

How To: Evaluate combinations of functions from graphs

How To: Use a TI89 calculator to graph linear equations

How To: Solve problems involving functions in algebra

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

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