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 tell whether two fractions are equivalent to one another.
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How To: Use ">" (greater than) and "<" (less than) symbols

How To: Identify characteristics of a sample during a survey

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

How To: Divide and give an answer as a fraction

How To: Increase a number by a percentage in basic arithmetic

How To: Find percent by mass & percent composition

How To: Factor a trinomial with a negative in front

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

How To: Find the Percent Given Two Numbers

How To: Calculate Faster Than a Calculator

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

How To: Find the equation of a circle given: center & tangent

How To: Convert Fahrenheit to Celsius with a formula

How To: Simplify a complex fraction w/ binomial denominators

How To: Solve percent proportions

How To: Do long division without a calculator

How To: Find the area of a triangle when given 2 sides & angle

How To: Calculate the area of a parallelogram

How To: Divide small numbers by big numbers

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