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 simplify a rate or ration using simple math.
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How To: Remember "greater than" & "less than" symbols

How To: Find the Percent Given Two Numbers

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

How To: Convert between diameter and radius

How To: Find the perimeter & area of a complex figure

How To: Convert fractions to percents in two steps

How To: Do long division without a calculator

How To: Find the coordinate of a point

How To: Divide small numbers by big numbers

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

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

How To: Find a number given Its percent

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

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

How To: Find the Volume of Composite Figures (Also Called Composite Shapes)

How To: Find the area of a parallelogram using geometry

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

How To: Identify characteristics of a sample during a survey

How To: Solve a problem that asks you to identify percent, amount and base

How To: Subtract mixed numbers with borrowing

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

How To: Find the Percent Given Two Numbers

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

How To: Convert between diameter and radius

How To: Find the perimeter & area of a complex figure

How To: Convert fractions to percents in two steps

How To: Do long division without a calculator

How To: Find the coordinate of a point

How To: Divide small numbers by big numbers

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

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

How To: Find a number given Its percent

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

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

How To: Find the Volume of Composite Figures (Also Called Composite Shapes)

How To: Find the area of a parallelogram using geometry

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

How To: Identify characteristics of a sample during a survey

How To: Solve a problem that asks you to identify percent, amount and base

How To: Subtract mixed numbers with borrowing
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