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 pop. proportion problems in stats.
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How To: Find the Percent Given Two Numbers

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

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

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

How To: Spend Money on a Graphing Calculator? Nah—Just Use This WebBased TI Emulator

How To: Do long division without a calculator

How To: Figure out the domain & range of a piecewise function

How To: Calculate percent composition for chemistry

How To: Calculate the area of a parallelogram

How To: Calculate percent error in chemistry lab activities

How To: Find a missing coordinate given: coordinate & equation

How To: Rotate a shape about the origin 90° counterclockwise

How To: Find the area of irregular shapes

How To: Find the slope of a line given 2 points with fractions

How To: Find the 100th term in a sequence

How To: Find extra points for a parabola (quadractic equation)

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

How To: Find the Slope Given 2 Ordered Pairs

How To: Calculate the height and volume of a pyramid

How To: Find the Percent Given Two Numbers

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

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

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

How To: Spend Money on a Graphing Calculator? Nah—Just Use This WebBased TI Emulator

How To: Do long division without a calculator

How To: Figure out the domain & range of a piecewise function

How To: Calculate percent composition for chemistry

How To: Calculate the area of a parallelogram

How To: Calculate percent error in chemistry lab activities

How To: Find a missing coordinate given: coordinate & equation

How To: Rotate a shape about the origin 90° counterclockwise

How To: Find the area of irregular shapes

How To: Find the slope of a line given 2 points with fractions

How To: Find the 100th term in a sequence

How To: Find extra points for a parabola (quadractic equation)

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

How To: Find the Slope Given 2 Ordered Pairs

How To: Calculate the height and volume of a pyramid
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