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. 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 that require you to find price per unit.
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How To: Find the Percent Given Two Numbers

How To: Understand the rule of vertically opposite angles

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

How To: Calculate Faster Than a Calculator

How To: Do long division without a calculator

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

How To: Divide small numbers by big numbers

How To: Calculate the growth rate or percentage change between two numbers

How To: Solve word problems involving the addition of whole numbers

How To: Solve exponential and logarithmic equations

How To: Find a number given Its percent

How To: Convert between diameter and radius

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

How To: Determine the age of a fossil using carbon14

How To: Square expressions involving radicals

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How To: Increase a number by a percentage in basic arithmetic

How To: Find an angle when there are pairs of parallel lines

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