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Wednesday, March 2, 2011

Natural #'s, Whole #'s, Integers, Rational, & Irrational #'s

Natural Numbers vs. Whole Numbers at Virtual Nerd
►If that video helped you, here are more videos from Virtual Nerd about kinds of numbers.

Algebra - Properties of Real Numbers from Yay Math on Vimeo.

Other examples:
►6/3 = 2, so this fraction is a natural number.  It is also a whole number, an integer, and a rational number.
►√4 = 2, so this is a natural number, a whole number, an integer, and a rational number.
Any number that can be written as a fraction is a rational number.  2 can be written as 2/1.
►√-1 is irrational, because the number inside the square root has been squared; multiplied by itself.
Such as √16 = 4.  16 is a square of 4.  So 4 is the square root.
BUT what would be the square root of √-16?  There is no answer, so this is irrational.

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