התחבר/י באמצעות
- או -
\[\begin{aligned} 500+300=? \end{aligned}\]
\[\begin{aligned} 200-100=? \end{aligned}\]
\[\begin{aligned} 400-200=? \end{aligned}\]
\[\begin{aligned} 500-500=? \end{aligned}\]
\[\begin{aligned} 600-200=? \end{aligned}\]