\[\boxed{\text{465\ (465).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ \frac{4}{5} = \frac{8}{10} = 0,8;\]
\[2)\ \frac{3}{8} = \frac{375}{1000} = 0,375;\]
\[3)\ \frac{7}{16} = \frac{4375}{10000} = 0,4375;\]
\[4)\ \frac{97}{80} = 1\frac{17}{80} = 1\frac{2125}{10000} =\]
\[= 1,2125;\]
\[5)\ \frac{42}{15} = 2,8.\ \]