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 solve word problems involving direct variation.
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How To: Calculate Faster Than a Calculator

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

How To: Find the formula of a piecewise function given a graph

How To: Find the Percent Given Two Numbers

How To: Convert Fahrenheit to Celsius with a formula

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

How To: Spend Money on a Graphing Calculator? Nah—Just Use This WebBased TI Emulator

How To: Simplify a quadratic formula result

How To: Graph square root functions & inequalities

How To: Find a number given Its percent

How To: Find the slope of a line given 2 points with fractions

How To: Learn Calculus in 20 minutes

How To: Find the slope from a set of points

How To: Solve problems involving functions in algebra

How To: Convert fractions to percents in two steps

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

How To: Find the Volume of Composite Figures (Also Called Composite Shapes)

How To: Identify characteristics of a sample during a survey

How To: Find the equation of a line given 1 point

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