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. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to convert between decimeters and kilometers in basic mathematics.
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How To: Use ">" (greater than) and "<" (less than) symbols

How To: Divide small numbers by big numbers

How To: Find the Percent Given Two Numbers

How To: Find a number given Its percent

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

How To: Find and sketch the domain of a multivariable function

How To: Find the 100th term in a sequence

How To: Find the lowest common multiple/LCM with a factor tree

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How To: Find the standard deviation with the ZScore formula

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