\documentclass[french,xcolor={table,svgnames}]{beamer}
\usefonttheme[onlymath]{serif}
\setbeamertemplate{navigation symbols}{}
\usepackage{babel}
\usepackage{ProfCollege90}
\begin{document}
\QFlash[Heure]{121530/Ajoute \SI{30}{\second}/Ajoute \SI{1}{\hour}/Ajoute \SI{45}{\minute}/Soustrais \SI{15}{\minute}}
\end{document}