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: Find the Percent Given Two Numbers

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

How To: Find a number given Its percent

How To: Calculate Faster Than a Calculator

How To: Divide small numbers by big numbers

How To: Do long division without a calculator

How To: Convert between diameter and radius

How To: Find Leg Lengths and Hypotenuse of a 45 45 90 Triangle

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

How To: Find a missing side of a triangle, similar to another

How To: Find the area of a parallelogram using geometry

How To: Calculate the area of a parallelogram

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

How To: Solve percentages without a calculator

How To: Find density using the water displacement method

How To: Solve multistep equations with absolute values

How To: Calculate percent composition for chemistry

How To: Write a slopeintercept equation given an XY table

How To: Find the formula of a piecewise function given a graph

How To: Convert Fahrenheit to Celsius with a formula
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