Brug Mix (reeks 1)

Reken uit

\(51 + 35 = \ldots\)

\(\begin{align} & 51 + 35\\= & \color{green}{50} + \color{red}{1} + \color{green}{30} + \color{red}{5} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)