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 explain what a percentage is within the context of basic arithmetic.
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How To: Calculate Faster Than a Calculator

How To: Find the Percent Given Two Numbers

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

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

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 slope of a line given 2 points with fractions

How To: Derive the area of a circle

How To: Find the standard error of the mean

How To: Find a number given Its percent

How To: Do long division without a calculator

How To: Learn Calculus in 20 minutes

How To: Calculate the height and volume of a pyramid

How To: Find a missing angle in a parallelogram

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How To: Solve rational equations easily

How To: Simplify & solve multistep equations in algebra

How To: Bisect a line segment

How To: Identify geometric sequences and find the nth term
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