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 word problems that require you to simplify rational expressions.
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How To: Find the Height of a Trapezoid.

How To: Convert between diameter and radius

How To: Calculate the area of a parallelogram

How To: Do long division without a calculator

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

How To: Simplify cube roots

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

How To: Match exponential graphs

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

How To: Calculate Faster Than a Calculator

How To: Find the Percent Given Two Numbers

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

How To: Learn Calculus in 20 minutes

How To: Find the coordinate of a point

How To: Spend Money on a Graphing Calculator? Nah—Just Use This WebBased TI Emulator

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

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

How To: Find Leg Lengths and Hypotenuse of a 45 45 90 Triangle

How To: Find the volume of a swimming pool

How To: Multiply & Divide Numbers (Basic Elementary Math)
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