How do you simplify: square root of 1/3?
Usually the final answer is written as
To get the final answer, you need to "rationalize the denominator" by multiplying by
It is not "mathematically illegal" to write this number as
1) It helps teachers check your answers more easily.
2) Rationalizing the denominator (or numerator, for that matter) is a useful skill that can help you solve problems in higher math. For instance, in calculus, it's a trick that can often help you solve some problems about "limits".