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

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

How To: Do long division without a calculator

How To: Evaluate fractions containing variables

How To: Write a logarithm as a sum or difference of logarithms

How To: Calculate percent composition for chemistry

How To: Calculate the area of a parallelogram

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

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

How To: Find the standard deviation with the ZScore formula

How To: Cancel out in basic algebra

How To: Find the Percent Given Two Numbers

How To: Find a number given Its percent

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

How To: Write a sum/difference of logarithms as a logarithm

How To: Find the Slope Given 2 Ordered Pairs

How To: Convert Fahrenheit to Celsius with a formula

How To: Determine the age of a fossil using carbon14

How To: Find the area of a circle when you know the diameter

How To: Do normal probability calculations on a calculator
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