Answer
$\frac{3}{5} \lt \frac{5}{8}$
Work Step by Step
$\frac{3}{5}$ _ $\frac{5}{8}$
To compare two fractions we need to have common denominator.
= $\frac{3\times8}{5\times8}$ and $\frac{5\times5}{8\times5}$ (LCM of 8 & 5 is 40)
= $\frac{24}{40}$ and $\frac{25}{40}$
= $\frac{24}{40} \lt \frac{25}{40}$ (As 24 $\lt$ 25)
i.e. $\frac{3}{5} \lt \frac{5}{8}$