Estimate the value of the following numbers to the nearest whole number
$\sqrt{780}$

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Solution

$\sqrt{780} = \sqrt{2 \times 2 \times 5 \times 3 \times 13}$
$= 2 \sqrt{195}$
$= 2 \times 13.96$
$= 27.93 \approx 28$

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