$a)$

$0,8=\frac{8}{10}=\frac{4}{5}$

$7,9=7\frac{9}{10}$

$\frac{87}{5}=87\frac{5}{10}=87\frac{1}{2}$

$101,3=101\frac{3}{10}$

$66,2=66\frac{2}{10}=66\frac{1}{5}$

 

$b)$

$0,80=\frac{80}{100}=\frac{8}{10}=\frac{4}{5}$

$9,08=9\frac{8}{100}=9\frac{2}{25}$

$20,67=20\frac{67}{100}$

$807,44=807\frac{44}{100}=807\frac{11}{25}$

$23,32=23\frac{32}{100}=23\frac{8}{25}$

 

$c)$

$0,800=\frac{800}{1000}=\frac{8}{10}=\frac{4}{5}$

$0,123=\frac{123}{1000}$

$4,504=4\frac{504}{1000}=4\frac{126}{250}$

$61,002=61\frac{2}{1000}=61\frac{1}{500}$

$20,034=20\frac{34}{1000}=20\frac{17}{500}$