convert

\begin{tabular}{|c||c||c|} \hline kilograms & grams & milligrams \\ \hline 14.2 & & \\ \hline \hline & & \\ \hline \multicolumn{1}{|c|}{89.9} & \\ \hline \hline & & \multicolumn{1}{|c|}{60.0} \\ \hline \end{tabular}