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: Divide small numbers by big numbers

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

How To: Find the Percent Given Two Numbers

How To: Find a number given Its percent

How To: Determine math proportions with the SquareCube Law

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

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

How To: Do long division without a calculator

How To: Convert Fahrenheit to Celsius with a formula

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

How To: Square expressions involving radicals

How To: Simplify radicals which are not perfect squares

How To: Find the x & y intercepts of rational functions

How To: Find the percentage of a number easily

Use the quadratic equation: finding the mirror point

How To: Solve equations involving square roots

How To: Graph a linear equation in 3 different ways

How To: Find the equation of a perpendicular line easily

How To: Divide proper fractions

How To: Add, subtract, multiply & simplify polynomials
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