Convert mixed number to fraction.
$$\dfrac{ 39 }{ 81 }$$ .Simplify $ \dfrac{ 39 }{ 81 } $ by dividing both 39 and 81 by their GCD, which is 3. GCD(39, 81) = 3.
$$ \frac{ 39 }{ 81 } = \frac{ 39 : \color{blue}{ 3 } }{ 81 : \color{blue}{ 3 } } = \frac{ 13 }{ 27 } $$