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

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How To: Find the Percent Given Two Numbers

How To: Calculate Faster Than a Calculator

How To: Determine the age of a fossil using carbon14

How To: Find a number given Its percent

How To: Convert between diameter and radius

How To: Do long division without a calculator

How To: Calculate the area of a parallelogram

How To: Find the area of a circle when you know the diameter

How To: Find the coordinate of a point

How To: Find the opposite and absolute value of a number

How To: Find the area of irregular shapes

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How To: Find the length of a median in a trapezoid

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