בחרו את התשובה המתאימה
\[\begin{aligned} 400+100=? \end{aligned}\]
\[\begin{aligned} 400+100=? \end{aligned}\]
\[\begin{aligned} 1000-500=? \end{aligned}\]
\[\begin{aligned} 900+100=? \end{aligned}\]
\[\begin{aligned} 700-300=? \end{aligned}\]
\[\begin{aligned} 100-100=? \end{aligned}\]