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

(ii) 400

Answers (1)

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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