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Power of Ten
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"Powers of 10" are the number 10 raised to any power, including negative powers.
The metric system is based on powers of 10.
Examples: Powers of 10
102 , 103 , 108 , 10-2 , 10-14

Positive powers of ten equal 10 times itself that many times.

Examples: Positive Powers of 10
102 = 10 times itself 2 times = 10 x 10
103 = 10 times itself 3 times = 10 x 10 x 10
107 = 10 times itself 7 times = 10 x 10 x 10 x 10 x 10 x 10 x 10

Negative powers of ten equal 1 divided by ten times itself that many times.

(Don't worry about why.)
Examples: Negative Powers of 10
10-2 = 1 divided by 10 times itself 2 times = 1/(10 x 10 )
10-3 = 1 divided by 10 times itself 2 times = 1/(10 x 10 x 10 )
10-7 = 1 divided by 10 times itself 2 times = 1/(10 x 10 x 10 x 10 10 x 10 x 10 )

Any number to the zero power equals 1. So 100 = 1

Don't worry about why, unless you like worrying. :)
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