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 unpack and solve problems that require you to estimate differences by rounding.
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How To: Prove a triangle inscribed in a circle is right angled

How To: Solve equations with the order of operations

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How To: Estimate probabilities with the empirical rule

How To: Evaluate square roots

How To: Convert decimals into fractions

How To: Calculate the area of a triangle using a basic formula

How To: Add consecutive odd numbers

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

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How To: Find outliers using the Zscore method

How To: Find a data point (Xi) with the ZScore formula
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