Brug over tiental

Reken uit

\(9 + 34 = \ldots\)

\(\begin{align} & 9 + 34 \\= & 34 + 9 \\= & 34 + \color{green}{6} + \color{red}{3} \\= & \color{green}{40} + \color{red}{3} \\= & \color{red}{43} \end{align}\)