1/8:4/5 6 3/4:1 11/45 8/13:4 2 2/9:1 7/9

1) $\frac{1}{8} : \frac{4}{5} = \frac{1}{8} * \frac{5}{4} = \frac{5}{32} = 0,15625$

2) $6\frac{3}{4} : 1\frac{11}{45} = \frac{27}{4} : \frac{56}{45} = \frac{27}{4} * \frac{45}{56} = \frac{1215}{224} = 5\frac{95}{224}$

3) $\frac{8}{13} : \frac{4}{1} = \frac{8}{13} * \frac{1}{4} = \frac{2}{13}$

4) $2\frac{2}{9} : 1\frac{7}{9} = \frac{20}{9} : \frac{16}{9} = \frac{20}{9} * \frac{9}{16} = \frac{5}{4} = 1\frac{1}{4} = 1,25$