Looking for a guide on how to tell whether two fractions are rationally equivalent to one another? 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 finish your homework or 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 work with fraction equivalency in basic math.
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How To: Calculate percent composition for chemistry

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How To: Find the standard deviation with the ZScore formula

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