$\dfrac{13}{88}\times 3$ =

$21 \times\dfrac{11}{-77}$ =

$\dfrac{13}{10}\times\dfrac{3}{5}$ =

$\dfrac{-7}{19}\times\dfrac{-3}{2}$ =

$\dfrac{11}{7}\times\dfrac{10}{4}$ =

$\dfrac{3}{5}\times\dfrac{7}{2}$ =

$\dfrac{14}{3}\times\dfrac{2}{9}$ =

$\dfrac{3}{10}\times\dfrac{15}{19}$ =

$7 \times\dfrac{18}{42}$ =

$\dfrac{3}{19}\times\dfrac{9}{6}$ =