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: Calculate Faster Than a Calculator

How To: Find a slope of a straight line with: Ax + By + C = 0

How To: Find a number given Its percent

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

How To: Learn Calculus in 20 minutes

How To: Solve word problems involving domain and range

How To: Estimate probabilities with the empirical rule

How To: Use special substitutions in calculus II

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

How To: Find the Percent Given Two Numbers

How To: Find the area of a parallelogram using geometry

How To: Calculate the area of a parallelogram

How To: Convert between diameter and radius

How To: Calculate math without a calculator

How To: Determine the age of a fossil using carbon14

How To: Divide decimals

How To: Be a human calculator

How To: Find the slope from a set of points

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

How To: Do normal probability calculations on a calculator
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