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Q.4 Find the square roots of the following numbers by the Prime Factorisation Method.

(ii) 400

Answers (1)

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By prime factorization, we get

$400 = 2\times2\times2\times2\times5\times5$

or $400 = (2\times2\times5)^{2} = 20^{2}$

Thus the square root of 400 is 20

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Devendra Khairwa

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