\begin{tabular*}{0.75\textwidth}{@{\extracolsep{\fill}} | c | c | c | c | c | c | c |} \hline 2.9 & 2.99 & 2.999 & 3 & 3.001 & 3.01 & 3.1 \\ \hline -2 & 2 & -2 & 2 & -2 & 2 & -2 \\ \hline \end{tabular*}