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: Write a slopeintercept equation given an XY table

How To: Find extra points for a parabola (quadractic equation)

How To: Do long division without a calculator

How To: Calculate percent composition for chemistry

How To: Find a number given Its percent

How To: Find the Slope Given 2 Ordered Pairs

How To: Find the area of a parallelogram using geometry

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

How To: Calculate Faster Than a Calculator

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

How To: Divide small numbers by big numbers

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

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

How To: Find Leg Lengths and Hypotenuse of a 45 45 90 Triangle

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

How To: Find a missing coordinate given: coordinate & equation

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

How To: Evaluate combinations of functions from graphs
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