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

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How To: Find the lowest common multiple/LCM with a factor tree

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

How To: Find the Percent Given Two Numbers

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

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

How To: Find the 100th term in a sequence

How To: Convert fractions to decimals quickly and easily

How To: Quickly find the area of a trapezoid

How To: Find the opposite and absolute value of a number

How To: Draw a perpendicular line from a point on a line

How To: Do long division without a calculator

How To: Divide small numbers by big numbers

How To: Find the area of a parallelogram using geometry

How To: Convert Fahrenheit to Celsius with a formula

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

How To: Do normal probability calculations on a calculator
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