Convert mixed number to fraction.
$$\dfrac{ 4 }{ 40 }$$ .Simplify $ \dfrac{ 4 }{ 40 } $ by dividing both 4 and 40 by their GCD, which is 4. GCD(4, 40) = 4.
$$ \frac{ 4 }{ 40 } = \frac{ 4 : \color{blue}{ 4 } }{ 40 : \color{blue}{ 4 } } = \frac{ 1 }{ 10 } $$