השלמת לוח חיבור

‎\begin{array}{c|c}
\hline
+ & 8 & 1 & 10 \\
\hline
5 & \INPUTBOX{4}{ltr}{13} & \INPUTBOX{5}{ltr}{6} & \INPUTBOX{6}{ltr}{15} \\
\hline
\INPUTBOX{1}{ltr}{1} & \INPUTBOX{2}{ltr}{9} & 2 & \INPUTBOX{3}{ltr}{11} \\
\hline
\INPUTBOX{7}{ltr}{5} & 13 & \INPUTBOX{8}{ltr}{6} & \INPUTBOX{9}{ltr}{15} \\
\end{array}

‎\begin{array}{c|c}
\hline
+ & 5 & 10 & 8 \\
\hline
\INPUTBOX{1}{ltr}{0} & \INPUTBOX{2}{ltr}{5} & 10 & \INPUTBOX{3}{ltr}{8} \\
\hline
0 & \INPUTBOX{4}{ltr}{5} & \INPUTBOX{5}{ltr}{10} & \INPUTBOX{6}{ltr}{8} \\
\hline
\INPUTBOX{7}{ltr}{2} & 7 & \INPUTBOX{8}{ltr}{12} & \INPUTBOX{9}{ltr}{10} \\
\end{array}

‎\begin{array}{c|c}
\hline
+ & 6 & 6 & 7 \\
\hline
9 & \INPUTBOX{5}{ltr}{15} & \INPUTBOX{4}{ltr}{15} & \INPUTBOX{6}{ltr}{16} \\
\hline
\INPUTBOX{1}{ltr}{6} & 12 & \INPUTBOX{2}{ltr}{12} & \INPUTBOX{3}{ltr}{13} \\
\hline
\INPUTBOX{7}{ltr}{2} & \INPUTBOX{8}{ltr}{8} & 8 & \INPUTBOX{9}{ltr}{9} \\
\end{array}

‎\begin{array}{c|c}
\hline
+ & 9 & 4 & 2 \\
\hline
\INPUTBOX{1}{ltr}{3} & \INPUTBOX{2}{ltr}{12} & 7 & \INPUTBOX{3}{ltr}{5} \\
\hline
4 & \INPUTBOX{4}{ltr}{13} & \INPUTBOX{5}{ltr}{8} & \INPUTBOX{6}{ltr}{6} \\
\hline
\INPUTBOX{7}{ltr}{6} & 15 & \INPUTBOX{8}{ltr}{10} & \INPUTBOX{9}{ltr}{8} \\
\end{array}