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 (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to unpack and solve word problems requiring use of the commutative law of addition.
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How To: Calculate the area of a parallelogram

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How To: Use a TI89 to calculate nCr

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

How To: Solve for the missing ratios or proportions

How To: Find the volume of a swimming pool

How To: Convert Fahrenheit to Celsius for chemistry

How To: Derive the equation of a straight line

How To: Find standard deviation

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

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

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

How To: Calculate Faster Than a Calculator

How To: Calculate the area of a parallelogram

How To: Find a number given Its percent

How To: Translate a shape

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

How To: Find the Percent Given Two Numbers

How To: Find the slope from a set of points

How To: Be a human calculator

How To: Use a TI89 to calculate nCr

How To: Evaluate functions on a calculator TI89

How To: Find the area of a parallelogram using geometry

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

How To: Solve for the missing ratios or proportions

How To: Find the volume of a swimming pool

How To: Convert Fahrenheit to Celsius for chemistry

How To: Derive the equation of a straight line

How To: Find standard deviation
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