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. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to answer problems that require you to find the square root of a number.
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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 a number given Its percent

How To: Find the equation of a circle given: center & tangent

How To: Divide and give an answer as a fraction

How To: Factor a trinomial with a negative in front

How To: Calculate percent composition for chemistry

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

How To: Convert Fahrenheit to Celsius with a formula

How To: Identify characteristics of a sample during a survey

How To: Determine the age of a fossil using carbon14

How To: Factor a trinomial with negative leading coefficient

How To: Convert fractions to percents in two steps

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

How To: Increase a number by a percentage in basic arithmetic

How To: Find the area of irregular shapes

How To: Find the percent change using proportions

How To: Find percent by mass & percent composition
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