Question 4 (ii)
Find the square roots of the following numbers by the Prime Factorizationmethod:
400

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Solution

400

$\sqrt{400} = \sqrt{2 \times 2 \times 2 \times 2 \times 5 \times 5} = 2 \times 2 \times 5 = 20 \begin{matrix} 2 & 400 2 & 200 2 & 100 2 & 50 5 & 25 5 & 5 1 \end{matrix}$

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