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 rewrite a ratio as a fraction in its simplest form.
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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: Find a number given Its percent

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

How To: Find the Slope Given 2 Ordered Pairs

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

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

How To: Learn Calculus in 20 minutes

How To: Calculate math without a calculator

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

How To: Calculate Faster Than a Calculator

How To: Do long division without a calculator

How To: Calculate the area of a parallelogram

How To: Write a slopeintercept equation given an XY table

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

How To: Find the area of irregular shapes

How To: Calculate percent composition for chemistry

How To: Write a sum/difference of logarithms as a logarithm

How To: Find the Height of a Trapezoid.

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: Find a number given Its percent

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

How To: Find the Slope Given 2 Ordered Pairs

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

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

How To: Learn Calculus in 20 minutes

How To: Calculate math without a calculator

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

How To: Calculate Faster Than a Calculator

How To: Do long division without a calculator

How To: Calculate the area of a parallelogram

How To: Write a slopeintercept equation given an XY table

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

How To: Find the area of irregular shapes

How To: Calculate percent composition for chemistry

How To: Write a sum/difference of logarithms as a logarithm

How To: Find the Height of a Trapezoid.
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