$$2\div\frac{1}{5}=10$$ 

 $$3\div\frac{9}{7}=2\frac{2}{3}$$ 

1. To divide a whole by a fraction, flip the fraction and multiply
2.  $$2\div\frac{1}{5}=2\times\frac{5}{1}=10$$ 
3.   $$3\times\frac{9}{7}=\frac{3\times7}{9}=\frac{21}{9}=2\frac{1}{3}$$