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 reduce and simpify rational expressions in algebra.
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How To: Calculate Faster Than a Calculator

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How To: Find the Percent Given Two Numbers

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

How To: Calculate the area of a parallelogram

How To: Simplify a complex fraction w/ binomial denominators

How To: Add ounces and pounds together in basic mathematics

How To: Find a number given Its percent

How To: Find the area of a parallelogram using geometry

How To: Calculate percent composition for chemistry

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

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

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

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

How To: Do long division with decimals

How To: Cancel out in basic algebra

How To: Find the sum of reciprocals of complex numbers

How To: Determine if a point lies on a line in slope intercept

How To: Find the highest common factor (or HCF) of two numbers

How To: Simplify surds (improper square roots)
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