\documentclass[margin=3mm]{petiteannonce}
%\usepackage{siunitx}
\usepackage{graphicx}
\usepackage{array}
\usepackage{eurosym}
\begin{document}
\petiteannonce[cols=2, count=6]{take my number}{%
\centering \textbf{Title}\\
$\overline{\hspace*{7cm}}$\\ \flushleft
text\\ of \\the \\announce\\
Even with math formulas $e^{i \pi}-1=0$
}
\end{document}
