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 apply rational equations.
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How To: Use ">" (greater than) and "<" (less than) symbols

How To: Find the Percent Given Two Numbers

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

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

How To: Find the area of a circle when you know the diameter

How To: Determine the age of a fossil using carbon14

How To: Find the opposite and absolute value of a number

How To: Do long division without a calculator

How To: Calculate the area of a parallelogram

How To: Find the area of irregular shapes

How To: Divide small numbers by big numbers

How To: Convert Fahrenheit to Celsius with a formula

How To: Convert between diameter and radius

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

How To: Find the coordinate of a point

How To: Calculate math without a calculator

How To: Find the area of an oblique triangle using formulas

How To: Use derivatives to find slope in calculus

How To: Solve rateofchange problems with derivatives
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