Convert mixed number to fraction.
$$\dfrac{ 15 }{ 3 }$$ .Simplify $ \dfrac{ 15 }{ 3 } $ by dividing both 15 and 3 by their GCD, which is 3. GCD(15, 3) = 3.
$$ \frac{ 15 }{ 3 } = \frac{ 15 : \color{blue}{ 3 } }{ 3 : \color{blue}{ 3 } } = \frac{ 5 }{ 1 } $$