Convert mixed number to fraction.
$$\dfrac{ 65 }{ 80 }$$ .Simplify $ \dfrac{ 65 }{ 80 } $ by dividing both 65 and 80 by their GCD, which is 5. GCD(65, 80) = 5.
$$ \frac{ 65 }{ 80 } = \frac{ 65 : \color{blue}{ 5 } }{ 80 : \color{blue}{ 5 } } = \frac{ 13 }{ 16 } $$