The square root of 68 is 8.246211251 rounded to 9 decimal places.
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The square root of 500 is 22.36067977...
The square root of 16 is 4. See how you get that is by knowing whats 4 squared.
The idea is to find a perfect square among its factors, such as two square, three square, etc. In this case, the square root of 68, root(68), equals root(4 x 17) = root(4) x root(17) = 2 root(17).
2 square root 17
7