Is $sqrt400$ a rational or irrational number?

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Answer 1 · 2015-07-09T14:56:34

$sqrt(400 = 20$ , so it is a rational number.

Before answering the question, we must simplify if possible.

$sqrt400 = sqrt(4*100) = sqrt4 * sqrt 100 = 2*10 = 20$

Is sqrt400sqrt400 a rational or irrational number?