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

How To: Do long division without a calculator

How To: Measure angles with a protractor in Geometry

How To: Calculate Faster Than a Calculator

How To: Find the Percent Given Two Numbers

How To: Find the value of a variable in an algebraic equation

How To: Find the coordinate of a point

How To: Rationalize square roots

How To: Use and find x & yintercepts in algebra

How To: Work with linear, quadratic & exponential models

How To: Multiply variables

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

How To: Convert Fahrenheit to Celsius with a formula

How To: Divide small numbers by big numbers

How To: Translate a sentence into math symbols

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

How To: Calculate the area of a parallelogram

How To: Solve problems involving functions in algebra

How To: Find the 100th term in a sequence

How To: Solve problems involving deductive reasoning
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