\documentclass[xcolor={table,svgnames}]{beamer}
\usefonttheme[onlymath]{serif}
\setbeamertemplate{navigation symbols}{}
\usepackage{ProfCollege90}

\begin{document}
\QFlash[Mental]{\num{18}/\num{12}/\num{8}/\num{10}/\num{9}/\num{20}/$\dfrac13$}
\end{document}