עָנוּ עַל הַשְּׁאֵלָה הַבָּאָה
הַשְׁלִימוּ אֶת לוּחַ הָחִבּוּר:
\begin{array}{c|c}
\hline
+ & 3 & 10 & 7 \\
\hline
10 & \INPUTBOX{4}{ltr}{13} & \INPUTBOX{5}{ltr}{20} & \INPUTBOX{6}{ltr}{17} \\
\hline
\INPUTBOX{1}{ltr}{7} & \INPUTBOX{2}{ltr}{10} & 17 & \INPUTBOX{3}{ltr}{14} \\
\hline
\INPUTBOX{7}{ltr}{7} & 10 & \INPUTBOX{8}{ltr}{17} & \INPUTBOX{9}{ltr}{14} \\
\end{array}
\hline
+ & 3 & 10 & 7 \\
\hline
10 & \INPUTBOX{4}{ltr}{13} & \INPUTBOX{5}{ltr}{20} & \INPUTBOX{6}{ltr}{17} \\
\hline
\INPUTBOX{1}{ltr}{7} & \INPUTBOX{2}{ltr}{10} & 17 & \INPUTBOX{3}{ltr}{14} \\
\hline
\INPUTBOX{7}{ltr}{7} & 10 & \INPUTBOX{8}{ltr}{17} & \INPUTBOX{9}{ltr}{14} \\
\end{array}