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 unpack and solve word problems that require you to subtract one decimal from another.
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How To: Remember "greater than" & "less than" symbols

How To: Do long division without a calculator

How To: Find the Percent Given Two Numbers

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How To: Evaluate logarithms using a calculator TI83

How To: Calculate percent composition for chemistry

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