Let k = sqrt(7) + sqrt(5). Truncate k to two decimal places.
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Originally Posted by fholik Let k = sqrt(7) + sqrt(5). Truncate k to two decimal places. Do you know how to find a decimal approximation for $\displaystyle \sqrt{n}$?
No
Google the Babylonian Method for evaluating square roots. Bascially it's divide, check, average...
But I need a "number sense" type shortcut that doesn't involve pencil and paper. Strictly mental math.
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