\begin{enumerate}
\begin{multicols}{2}
\item \begin{tabular}[t]{r|l}
75&3\\25&5\\5&5\\1&
\end{tabular}\\
Donc $75 = 3 \times 5^2$.
\columnbreak
\item \begin{tabular}[t]{r|l}
102&2\\51&3\\17&17\\1&
\end{tabular}\\
Donc $102=2 \times 3 \times 17$. 
\end{multicols}
\end{enumerate}

\begin{enumerate}[resume]
\begin{multicols}{2}
\item \begin{tabular}[t]{r|l}
\numprint{17640}&2\\\numprint{8820}&2\\\numprint{4410}&2\\\numprint{2205}&3\\735&3\\245&5\\49&7\\7&7\\1&\end{tabular}\\
Donc $\numprint{17640}=2^3 \times 3^2 \times 5 \times 7^2$.
\columnbreak
\item \begin{tabular}[t]{r|l}
\numprint{11375}&5\\\numprint{2275}&5\\455&5\\91&7\\13&13\\1&\end{tabular}\\
Donc $\numprint{11375}=5^3\times7\times13^2$.
\end{multicols}
\end{enumerate}
