השלמת לוח חיבור

‎\begin{array}{c|c}
\hline
+ & 2 & 0 & 8 \\
\hline
2 & \INPUTBOX{4}{ltr}{4} & \INPUTBOX{5}{ltr}{2} & \INPUTBOX{6}{ltr}{10} \\
\hline
\INPUTBOX{1}{ltr}{10} & \INPUTBOX{2}{ltr}{12} & 10 & \INPUTBOX{3}{ltr}{18} \\
\hline
\INPUTBOX{7}{ltr}{10} & 12 & \INPUTBOX{8}{ltr}{10} & \INPUTBOX{9}{ltr}{18} \\
\end{array}

‎\begin{array}{c|c}
\hline
+ & 4 & 0 & 0 \\
\hline
7 & \INPUTBOX{5}{ltr}{11} & \INPUTBOX{4}{ltr}{7} & \INPUTBOX{6}{ltr}{7} \\
\hline
\INPUTBOX{1}{ltr}{5} & 9 & \INPUTBOX{2}{ltr}{5} & \INPUTBOX{3}{ltr}{5} \\
\hline
\INPUTBOX{7}{ltr}{0} & \INPUTBOX{8}{ltr}{4} & 0 & \INPUTBOX{9}{ltr}{0} \\
\end{array}

‎\begin{array}{c|c}
\hline
+ & 0 & 3 & 4 \\
\hline
8 & \INPUTBOX{4}{ltr}{8} & \INPUTBOX{5}{ltr}{11} & \INPUTBOX{6}{ltr}{12} \\
\hline
\INPUTBOX{1}{ltr}{7} & \INPUTBOX{2}{ltr}{7} & 10 & \INPUTBOX{3}{ltr}{11} \\
\hline
\INPUTBOX{7}{ltr}{4} & 4 & \INPUTBOX{8}{ltr}{7} & \INPUTBOX{9}{ltr}{8} \\
\end{array}

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