Convert mixed number to fraction.
$$\dfrac{ 30 }{ 120 }$$ .Simplify $ \dfrac{ 30 }{ 120 } $ by dividing both 30 and 120 by their GCD, which is 30. GCD(30, 120) = 30.
$$ \frac{ 30 }{ 120 } = \frac{ 30 : \color{blue}{ 30 } }{ 120 : \color{blue}{ 30 } } = \frac{ 1 }{ 4 } $$