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 unpack and solve word problems requiring use of the commutative law of addition.
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How To: Find a number given Its percent

How To: Calculate percent composition for chemistry

How To: Convert Fahrenheit to Celsius with a formula

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

How To: Find the Percent Given Two Numbers

How To: Solve reverse percentage problems

How To: Calculate Faster Than a Calculator

How To: Find the slope from a set of points

How To: Find a slope of a straight line with: Ax + By + C = 0

How To: Use and find x & yintercepts in algebra

How To: Estimate probabilities with the empirical rule

How To: Solve problems involving deductive reasoning

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How To: Be a human calculator

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How To: Find the Slope Given 2 Ordered Pairs

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