$\frac{4}{10} \times \frac{6}{9} + \frac{6}{10} \times \frac{4}{9} = \frac{48}{90}$

$\frac{4}{10} \times \frac{6}{10} + \frac{6}{10} \times \frac{4}{10}$

$\frac{24}{90}$

$\frac{10}{90}$