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 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 rationalize a denominator.
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How To: Remember "greater than" & "less than" symbols

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

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

How To: Find the formula of a piecewise function given a graph

How To: Calculate percent composition for chemistry

How To: Find a number given Its percent

How To: Subtract a mixed number from a proper fraction in basic math

How To: Find and sketch the domain of a multivariable function

How To: Divide small numbers by big numbers

How To: Find the area & perimeter of triangles & squares

How To: Evaluate factorials with a TI83 calculator

How To: Add and subtract negative numbers in basic arithmetic

How To: Do long division without a calculator

How To: Find the Slope Given 2 Ordered Pairs

How To: Write a slopeintercept equation given an XY table

How To: Calculate probability in "at least one" problems

How To: Find the slope from a set of points

How To: Find the equation of a circle given: center & tangent

How To: Learn Calculus in 20 minutes

How To: Calculate the area of a parallelogram
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