Need to know how to work with logarithms in precalculus? You're in luck. 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 work with logarithms.
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How To: Find the Percent Given Two Numbers

How To: Find a number given Its percent

How To: Find the formula of a piecewise function given a graph

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

How To: Calculate Faster Than a Calculator

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

How To: Find the Slope Given 2 Ordered Pairs

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

How To: Do long division without a calculator

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

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

How To: Convert Fahrenheit to Celsius with a formula

How To: Write a slopeintercept equation given an XY table

How To: Round a decimal number to the nearest tenth in basic arithmetic

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How To: Calculate percent composition for chemistry

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How To: Isolate a variable

How To: Calculate the height and volume of a pyramid

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