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 problems that require you to estimate differences by rounding.
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How To: Remember "greater than" & "less than" symbols

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How To: Do long division without a calculator

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How To: Find extra points for a parabola (quadractic equation)

How To: Divide small numbers by big numbers

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How To: Find the area of a parallelogram using geometry

How To: Figure out the domain & range of a piecewise function

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How To: Simplify fourth roots

How To: Find measure of an exterior angle of a regular polygon

How To: Find the sides of a 306090 right triangle

How To: Calculate percent composition for chemistry

How To: Write a logarithm as a sum or difference of logarithms

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

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

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

How To: Find the Percent Given Two Numbers

How To: Calculate Faster Than a Calculator

How To: Find the Slope Given 2 Ordered Pairs

How To: Do long division without a calculator

How To: Find a missing side of a triangle, similar to another

How To: Find extra points for a parabola (quadractic equation)

How To: Divide small numbers by big numbers

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

How To: Convert between diameter and radius

How To: Find the area of a parallelogram using geometry

How To: Figure out the domain & range of a piecewise function

How To: Use a mean and scatter plot for Statistics

How To: Simplify fourth roots

How To: Find measure of an exterior angle of a regular polygon

How To: Find the sides of a 306090 right triangle

How To: Calculate percent composition for chemistry

How To: Write a logarithm as a sum or difference of logarithms

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