\documentclass[12pt]{}
\begin{document}
	\begin{center}
		\begin{tabular}{c|c}
			\hline
			$3.4$ & ‌	$3.4$ \\ 
			\textbf{	$3.4$}	& \mathbf{	$3.4$} \\ 
		\end{tabular}
	\end{center}
\end{document}