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 convert between decimeters and kilometers in basic mathematics.
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How To: Use ">" (greater than) and "<" (less than) symbols

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

How To: Do long division without a calculator

How To: Find the Percent Given Two Numbers

How To: Graph the greatest Integer or floor function

How To: Calculate Faster Than a Calculator

How To: Find a number given Its percent

How To: Identify characteristics of a sample during a survey

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

How To: Use a mean and scatter plot for Statistics

How To: Solve an equation with fractional powers

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

How To: Prove a triangle inscribed in a circle is right angled

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

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How To: Convert fractions to decimals quickly and easily

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How To: Calculate the area of a parallelogram

How To: Divide small numbers by big numbers
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