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: Find the Percent Given Two Numbers

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

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Find a number given Its percent

How To: Find the area & perimeter of triangles & squares

How To: Find a slope of a line parallel/perpendicular to it

How To: Do long division without a calculator

How To: Calculate percent composition for chemistry

How To: Write a logarithm as a sum or difference of logarithms

How To: Calculate Faster Than a Calculator

How To: Find the area of a triangle when given 2 sides & angle

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