\[\frac{3}{8} + \frac{5}{9} + \frac{5}{8} + \frac{4}{9} =\]
\[= \left( \frac{3}{8} + \frac{5}{8} \right) + \left( \frac{5}{9} + \frac{4}{9} \right) = \frac{8}{8} + \frac{9}{9} =\]
\[= 1 + 1 = 2\]