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

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

How To: Calculate Faster Than a Calculator

How To: Find the Percent Given Two Numbers

How To: Find the area of a parallelogram using geometry

How To: Do long division without a calculator

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

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

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

How To: Find a number given Its percent

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

How To: Solve for the missing ratios or proportions

How To: Calculate weight if given the mass

How To: Calculate the area of a parallelogram

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

How To: Convert between diameter and radius

How To: Determine the age of a fossil using carbon14

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

How To: Find and sketch the domain of a multivariable function

Find the discriminant (DELTA): quadratic equation
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