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: Calculate Faster Than a Calculator

Find the discriminant (DELTA): quadratic equation

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How To: Do normal probability calculations on a calculator

How To: Identify characteristics of a sample during a survey

How To: Compute a square root using the geometric method

How To: Calculate the area of complex shapes

How To: Isolate a variable

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

How To: Find the area of a parallelogram using geometry

How To: Calculate the area of a parallelogram

How To: Determine math proportions with the SquareCube Law

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

How To: Find a number given Its percent

How To: Do long division without a calculator

How To: Find the area & perimeter of triangles & squares

How To: Determine the age of a fossil using carbon14

How To: Calculate percent composition for chemistry

How To: Calculate probability in "at least one" problems

How To: Find the area of irregular shapes

How To: Calculate Faster Than a Calculator

Find the discriminant (DELTA): quadratic equation

How To: Calculate the sampling distribution of difference between means

How To: Do normal probability calculations on a calculator

How To: Identify characteristics of a sample during a survey

How To: Compute a square root using the geometric method

How To: Calculate the area of complex shapes

How To: Isolate a variable

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

How To: Find the area of a parallelogram using geometry

How To: Calculate the area of a parallelogram

How To: Determine math proportions with the SquareCube Law

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

How To: Find a number given Its percent

How To: Do long division without a calculator

How To: Find the area & perimeter of triangles & squares

How To: Determine the age of a fossil using carbon14

How To: Calculate percent composition for chemistry

How To: Calculate probability in "at least one" problems

How To: Find the area of irregular shapes
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