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 use rounding to estimate sums.
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How To: Solve for the missing ratios or proportions

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How To: Find a number given Its percent

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How To: Convert Fahrenheit to Celsius with a formula

How To: Convert fractions to percents in two steps

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