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

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

How To: Find how many toothpicks will be needed to form the nth figure in a sequence

How To: Solve for the missing ratios or proportions

How To: Work with linear, quadratic & exponential models

How To: Find a number given Its percent

How To: Find the Percent Given Two Numbers

How To: Convert Fahrenheit to Celsius with a formula

How To: Convert fractions to percents in two steps

How To: Calculate percent composition for chemistry

How To: Divide small numbers by big numbers

How To: Calculate the area of a parallelogram

How To: Use a TI89 to calculate nCr

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

How To: Do long division with decimals

How To: Learn Calculus in 20 minutes

How To: Find the length of a segment using the midpoint II

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

How To: Find the domain of a function in precalculus

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