הַשְׁלִימוּ אֶת לוּחַ הָחִבּוּר:
\begin{array}{c|c}
\hline
+ & 1 & 2 \\
\hline
2 & \INPUTBOX{1}{ltr}{3} & \INPUTBOX{2}{ltr}{4} \\
\hline
4 & \INPUTBOX{3}{ltr}{5} & \INPUTBOX{4}{ltr}{6} \\
\end{array}
\begin{array}{c|c}
\hline
+ & 1 & 2 \\
\hline
2 & \INPUTBOX{1}{ltr}{3} & \INPUTBOX{2}{ltr}{4} \\
\hline
4 & \INPUTBOX{3}{ltr}{5} & \INPUTBOX{4}{ltr}{6} \\
\end{array}