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

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

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

How To: Do long division without a calculator

How To: Find the Percent Given Two Numbers

How To: Solve equations with the order of operations

How To: Divide small numbers by big numbers

How To: Find percent by mass & percent composition

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

How To: Calculate the area of a parallelogram

How To: Find the area of irregular shapes

How To: Determine the age of a fossil using carbon14

How To: Simplify a complex fraction w/ binomial denominators

How To: Find the area of a parallelogram using geometry

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

How To: Convert Fahrenheit to Celsius with a formula

How To: Calculate the height and volume of a pyramid

How To: Find the Slope Given 2 Ordered Pairs

How To: Write a slopeintercept equation given an XY table

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

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

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

How To: Do long division without a calculator

How To: Find the Percent Given Two Numbers

How To: Solve equations with the order of operations

How To: Divide small numbers by big numbers

How To: Find percent by mass & percent composition

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

How To: Calculate the area of a parallelogram

How To: Find the area of irregular shapes

How To: Determine the age of a fossil using carbon14

How To: Simplify a complex fraction w/ binomial denominators

How To: Find the area of a parallelogram using geometry

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

How To: Convert Fahrenheit to Celsius with a formula

How To: Calculate the height and volume of a pyramid

How To: Find the Slope Given 2 Ordered Pairs

How To: Write a slopeintercept equation given an XY table
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