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cdw2014
1/12

When simplifying a radical, pull out any perfect squares. In this case it works out nicely. 1 is the square of 1 and 144 is the square of 12, so you get 1/12.

In another case such as sqrt(20) you can pull out a 4 which is a perfect square which leaves 5. So the answer would be 2sqrt(5).
[tex] \sqrt{ \frac{1}{144}} = \sqrt{ \frac{1}{ 12^{2}} } = \frac{1}{12} [/tex]

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