Convert mixed number to fraction.
$$\dfrac{ 4 }{ 10 }$$ .Simplify $ \dfrac{ 4 }{ 10 } $ by dividing both 4 and 10 by their GCD, which is 2. GCD(4, 10) = 2.
$$ \frac{ 4 }{ 10 } = \frac{ 4 : \color{blue}{ 2 } }{ 10 : \color{blue}{ 2 } } = \frac{ 2 }{ 5 } $$