0.1 times 50
\(0.1\,*\,50\,=\,\frac1{10}\,*\,50\,=\,\frac1{10}\,*\,\frac{50}1\,=\,\frac{1\,*\,50}{10\,*\,1}\,=\,\frac{50}{10}\,=\,\frac51\,=\,5\)