Convert mixed number to fraction.
$$\dfrac{ 84 }{ 210 }$$ .Simplify $ \dfrac{ 84 }{ 210 } $ by dividing both 84 and 210 by their GCD, which is 42. GCD(84, 210) = 42.
$$ \frac{ 84 }{ 210 } = \frac{ 84 : \color{blue}{ 42 } }{ 210 : \color{blue}{ 42 } } = \frac{ 2 }{ 5 } $$