\[\frac{7}{10} = \frac{21}{30};\ \ \frac{2}{3} = \frac{20}{30};\ \ \frac{1}{2} = \frac{15}{30};\ \]
\[\ \frac{13}{15} = \frac{26}{30}\]
\[\Rightarrow \frac{13}{15} > \frac{7}{10} > \frac{2}{3} > \frac{1}{2}.\]