Brug Mix (reeks 2)

Reken uit

\(85 + 1 = \ldots\)

\(\begin{align} & 85 + 1\\= & \color{green}{80} + \color{red}{5} + \color{green}{0} + \color{red}{1} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)