התחבר/י באמצעות
- או -
\[\begin{aligned} 900+100=? \end{aligned}\]
\[\begin{aligned} 900+0=? \end{aligned}\]
\[\begin{aligned} 700+100=? \end{aligned}\]
\[\begin{aligned} 900-200=? \end{aligned}\]
\[\begin{aligned} 500+300=? \end{aligned}\]