ענו על השאלה הבאה:
השלימו את לוח הכפל החלקי :
\begin{array}{c|c}
\times & 4 & \INPUTBOX{3}{ltr}{9} & -6 \\
\hline
\INPUTBOX{1}{ltr}{5} & 20 & \INPUTBOX{9}{ltr}{45} & \INPUTBOX{4}{ltr}{-30} \\
\hline
-9 & \INPUTBOX{6}{ltr}{-36} & -81 & \INPUTBOX{8}{ltr}{54} \\
\hline
\INPUTBOX{2}{ltr}{-1} & -4 & \INPUTBOX{7}{ltr}{-9} & \INPUTBOX{5}{ltr}{6} \\
\end{array}
\begin{array}{c|c}
\times & 4 & \INPUTBOX{3}{ltr}{9} & -6 \\
\hline
\INPUTBOX{1}{ltr}{5} & 20 & \INPUTBOX{9}{ltr}{45} & \INPUTBOX{4}{ltr}{-30} \\
\hline
-9 & \INPUTBOX{6}{ltr}{-36} & -81 & \INPUTBOX{8}{ltr}{54} \\
\hline
\INPUTBOX{2}{ltr}{-1} & -4 & \INPUTBOX{7}{ltr}{-9} & \INPUTBOX{5}{ltr}{6} \\
\end{array}