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: Find the Percent Given Two Numbers

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

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

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

How To: Isolate a variable

How To: Calculate the area of a parallelogram

How To: Find the area of a parallelogram using geometry

How To: Convert between diameter and radius

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

How To: Calculate Faster Than a Calculator

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

How To: Find a missing side of a triangle, similar to another

How To: Write a logarithm as a sum or difference of logarithms

How To: Convert fractions to percents in two steps

How To: Calculate weight if given the mass

How To: Find the 100th term in a sequence

How To: Do long division without a calculator

How To: Find the Percent Given Two Numbers

How To: Find a number given Its percent

How To: Calculate percent composition for chemistry

How To: Rotate a shape about the origin 90° counterclockwise

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

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

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

How To: Isolate a variable

How To: Calculate the area of a parallelogram

How To: Find the area of a parallelogram using geometry

How To: Convert between diameter and radius

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

How To: Calculate Faster Than a Calculator

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

How To: Find a missing side of a triangle, similar to another

How To: Write a logarithm as a sum or difference of logarithms

How To: Convert fractions to percents in two steps

How To: Calculate weight if given the mass

How To: Find the 100th term in a sequence

How To: Do long division without a calculator
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