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 solve pop. proportion problems in stats.
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How To: Use ">" (greater than) and "<" (less than) symbols

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

How To: Find the Percent Given Two Numbers

How To: Convert Fahrenheit to Celsius with a formula

How To: Identify characteristics of a sample during a survey

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

How To: Find percent by mass & percent composition

How To: Factor a trinomial with a negative in front

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

How To: Calculate percent composition for chemistry

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

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

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

How To: Find the area & perimeter of triangles & squares

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

How To: Divide and give an answer as a fraction

How To: Simplify a complex fraction w/ binomial denominators

How To: Solve percent proportions

How To: Do long division without a calculator
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