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 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 calculate the US unemployment rate given the raw data.
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How To: Convert between diameter and radius

How To: Calculate percent composition for chemistry

How To: Identify characteristics of a sample during a survey

How To: Find the coordinate of a point

How To: Find the 100th term in a sequence

How To: Do normal probability calculations on a calculator

How To: Evaluate successive percentage changes

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: Calculate the area of a parallelogram

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

How To: Calculate the area of complex shapes

How To: Draw a rhombus from Geometry

How To: Do long division without a calculator

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How To: Convert Fahrenheit to Celsius with a formula

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