Need to know how to solve algebraic word problems involving age? 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 threepart installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to unpack and solve agebased word problems.
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How To: Find the Percent Given Two Numbers

How To: Do long division without a calculator

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How To: Find the area of an oblique triangle using formulas

How To: Calculate percent composition for chemistry

How To: Find the standard deviation with the ZScore formula

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How To: Calculate the area of a parallelogram

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