# Math Help - truncating square roots

1. ## truncating square roots

Let k = sqrt(7) + sqrt(5). Truncate k to two decimal places.

2. 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 $\sqrt{n}$?

3. ## truncating square roots

No

4. Google the Babylonian Method for evaluating square roots.

Bascially it's divide, check, average...

5. ## truncating square roots

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