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 simple percent problems in basic arithmetic.
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How To: Remember "greater than" & "less than" symbols

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

How To: Find the Percent Given Two Numbers

How To: Convert Fahrenheit to Celsius with a formula

How To: Find a number given Its percent

How To: Calculate percent composition for chemistry

How To: Calculate the area of a parallelogram

How To: Find how many toothpicks will be needed to form the nth figure in a sequence

How To: Learn Calculus in 20 minutes

How To: Solve problems involving deductive reasoning

How To: Estimate probabilities with the empirical rule

How To: Determine if a point lies on a line in slope intercept

How To: Interpret a standard deviation

How To: Find the domain of a function in precalculus

How To: Test for symmetry algebraically

How To: Do long division without a calculator

How To: Find the formula of a piecewise function given a graph

How To: Find and sketch the domain of a multivariable function

How To: Factor a trinomial with negative leading coefficient

How To: Find the standard deviation with the ZScore formula
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