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: Remember "greater than" & "less than" symbols

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How To: Find the Percent Given Two Numbers

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How To: Do long division without a calculator

How To: Find Leg Lengths and Hypotenuse of a 45 45 90 Triangle

How To: Calculate percent composition for chemistry

How To: Spend Money on a Graphing Calculator? Nah—Just Use This WebBased TI Emulator

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How To: Solve for the missing ratios or proportions

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