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 an absolute value problem in algebra and graph your answer on a number line.
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How To: Find the Percent Given Two Numbers

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

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

How To: Find a slope of a straight line with: Ax + By + C = 0

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

How To: Find a number given Its percent

How To: Do long division without a calculator

How To: Divide small numbers by big numbers

How To: Convert between diameter and radius

How To: Learn Calculus in 20 minutes

How To: Use the ratio formula to find coordinates of a point

How To: Subtract a mixed number from a proper fraction in basic math

How To: Use an asymptote to find the equation of a hyperbola

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How To: Isolate a variable

How To: Convert fractions to percents in two steps

How To: Do normal probability calculations on a calculator

How To: Find the area of irregular shapes

How To: Solve direct proportions
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