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 requiring you to round whole numbers.
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How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

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

How To: Calculate percent composition for chemistry

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

How To: Learn Calculus in 20 minutes

How To: Find the surface area of a rectangular prism quickly

How To: Find the Percent Given Two Numbers

How To: Determine the age of a fossil using carbon14

Find the discriminant (DELTA): quadratic equation

How To: Find the 100th term in a sequence

How To: Factor a trinomial, GCF, then unfoil

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How To: Translate a shape

How To: Convert Fahrenheit to Celsius with a formula

How To: Find the area of irregular shapes

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

How To: Simplify fourth roots

How To: Find least common multiple in rational expressions

How To: Multiply Any Number by 11 with a Super Fast Mental Trick
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