4/10 in lowest terms.
4/10We can break it up into its factors4 = 2 x 210 = 2 x 5So then:\(\sf{ \frac{4}{10} = \frac{2\times2}{2\times5}}\)And if we remove the 2 from the numerator and denominator we are left with your answer which is:\(\boxed{\bf{\frac{2}{5}}}\)