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 calculate unknowns in proportions in algebra.
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How To: Use ">" (greater than) and "<" (less than) symbols

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

How To: Calculate the area of a parallelogram

How To: Calculate percent composition for chemistry

How To: Find a number given Its percent

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

How To: Find the Volume of Composite Figures (Also Called Composite Shapes)

How To: Divide small numbers by big numbers

How To: Find the slope from a set of points

How To: Factor trinomials with 2 variables & GCF by grouping

How To: Do long division without a calculator

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

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