\documentclass{article}
\begin{document}

{ \small
%\begin{table}[ht]
%\caption{?????-??????-??}
{\large \textbf{Training Data} } \\
\begin{tabular}{l l l l l}
\hline
\\
{\em Positive Training } & (21 cases) \\
11&13&17&19&2\\
23&29&3&31&37\\
41&43&47&5&53\\
59&61&67&7&71\\
73\\ \\
{\em Negative Training } & (22 cases) \\
10&12&14&15&16\\
18&20&21&22&24\\
25&26&27&28&30\\
32&33&34&4&6\\
8&9\\ \\
{\em Anchors } & (5 dimensions) \\
composite&number&orange&prime&record\\ \\
\end{tabular}





\begin{tabular}{l l l}\
{\large \textbf{Testing Results} } \\
& Positive tests & Negative tests \\
%heading
\hline
Positive&101, 103,&110 \\
Predictions&107, 109,& \\
&79, 83,& \\
&89, 91,& \\
&97& \\
\hline
Negative&&36, 38, \\
Predictions&&40, 42, \\
&&44, 45, \\
&&46, 48, \\
&&49 \\
{\large \textbf{ Accuracy } } & 18/19 = 94.74\% & \\
\end{tabular}
%\label{table:primes}
%\end{table}
}
\end{document}