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Math Help - truncating square roots

  1. #1
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    truncating square roots

    Let k = sqrt(7) + sqrt(5). Truncate k to two decimal places.
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  2. #2
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    Quote Originally Posted by fholik View Post
    Let k = sqrt(7) + sqrt(5). Truncate k to two decimal places.
    Do you know how to find a decimal approximation for \sqrt{n}?
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  3. #3
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    truncating square roots

    No
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  4. #4
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    Google the Babylonian Method for evaluating square roots.

    Bascially it's divide, check, average...
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  5. #5
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    truncating square roots

    But I need a "number sense" type shortcut that doesn't involve pencil and paper. Strictly mental math.
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