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 use rounding to estimate sums.
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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: Find the area of a parallelogram using geometry

How To: Do long division without a calculator

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

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

How To: Find the slope of a line given 2 points with fractions

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

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How To: Determine the age of a fossil using carbon14

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