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The square root of 256 would be 16. The way to double check this to see if it is correct is to multiply 16 x 16. The answer is 256, so that tells you it is correct.
http://answers.ask.com/Reference/Other/what_is_the...
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256 has two square roots: 16 and -16.
http://wiki.answers.com/Q/What_are_the_square_root...
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16
http://wiki.answers.com/Q/What_is_thje_square_root...
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A positive number has two square roots, its principal (positive) root and its negative root. This is because a negative number multiplied by a negative number equals a positive number
http://wiki.answers.com/Q/What_are_the_two_square_...
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