Avec l'extension `unicode-math` : % !TeX TS-program = xelatex \documentclass[french]{beamer} \usepackage{fontspec} \usepackage{siunitx} \usefonttheme{professionalfonts} \defaultfontfeatures{Ligatures=TeX, Scale=0.7} \setsansfont{erewhon} \sisetup{detect-all, output-decimal-marker={,},group-four-digits} \usepackage{babel} \usepackage{unicode-math} \begin{document} \begin{frame} \num{12356,4701}\\ \si{\kilogram\metre\per\second}\\ $\SI{42}{\kilogram\metre\per\second}$\\ \num{-.3e-45}\\ $\num{-.3e-45}$\\ $\num{12356,4701}$\\ \end{frame} \end{document}\end{document} ![alt text][1] [1]: https://texnique.fr/osqa/upfiles/Screen_Shot_2019-10-27_at_11.55.01.png

Avec l'extension `unicode-math` : % !TeX TS-program = xelatex \documentclass[french]{beamer} \usepackage{fontspec} \usepackage{siunitx} \usefonttheme{professionalfonts} \defaultfontfeatures{Ligatures=TeX, Scale=0.7} \setsansfont{erewhon} \sisetup{detect-all, output-decimal-marker={,},group-four-digits} \usepackage{babel} \usepackage{unicode-math} \begin{document} \begin{frame} \num{12356,4701}\\ \si{\kilogram\metre\per\second}\\ $\SI{42}{\kilogram\metre\per\second}$\\ \num{-.3e-45}\\ $\num{-.3e-45}$\\ $\num{12356,4701}$\\ \end{frame} \end{document}

% !TeX TS-program = xelatex \documentclass[french]{beamer} \usepackage{fontspec} \usepackage{siunitx} \usefonttheme{professionalfonts} \defaultfontfeatures{Ligatures=TeX, Scale=0.7} \setsansfont{erewhon} \sisetup{detect-all, output-decimal-marker={,},group-four-digits} \usepackage{babel} \usepackage{unicode-math} \begin{document} \begin{frame} \num{12356,4701}\\ \si{\kilogram\metre\per\second}\\ $\SI{42}{\kilogram\metre\per\second}$\\ \num{-.3e-45}\\ $\num{-.3e-45}$\\ $\num{12356,4701}$\\ \end{frame} \end{document}