Answer
$\frac{1}{6}$
Work Step by Step
First, you must get a common denominator, and in this case, it will be 6. Now you must make both fractions have a denominator of 6.
$\frac{2}{3}$=$\frac{4}{6}$. Now just subtract the numerators, and you will get your answer of $\frac{1}{6}$.