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: Find the Percent Given Two Numbers

How To: Calculate Faster Than a Calculator

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

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

How To: Find a number given Its percent

How To: Do long division without a calculator

How To: Find the Slope Given 2 Ordered Pairs

How To: Calculate the area of a parallelogram

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

How To: Calculate percent composition for chemistry

How To: Divide small numbers by big numbers

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

How To: Solve percentages without a calculator

How To: Calculate math without a calculator

How To: Reduce fractions to their lowest terms

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Convert between diameter and radius

How To: Find the area of a circle when you know the diameter

How To: Find the LCM & GCF of a number set with a Venn diagram

How To: Calculate weight if given the mass
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