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 associative law of addition.
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How To: Calculate Faster Than a Calculator

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

How To: Calculate percent composition for chemistry

How To: Simplify cube roots

How To: Calculate the area of a parallelogram

How To: Calculate the area of complex shapes

How To: Simplify Square and Cube Roots

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

How To: Do long division without a calculator

How To: Find a number given Its percent

How To: Divide small numbers by big numbers

How To: Find the volume of a sphere with radius r

How To: Be a human calculator

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

How To: Convert Fahrenheit to Celsius with a formula

How To: Find extra points for a parabola (quadractic equation)

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

How To: Use the ratio formula to find coordinates of a point

How To: Convert temperature using y = mx + b

How To: Evaluate a line integral along a straight line segment
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