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1. \(50 + 32 = \ldots\)
2. \(69 + 20 = \ldots\)
3. \(19 + 60 = \ldots\)
4. \(86 + 11 = \ldots\)
5. \(22 + 35 = \ldots\)
6. \(66 + 21 = \ldots\)
7. \(60 + 35 = \ldots\)
8. \(19 + 20 = \ldots\)
9. \(73 + 24 = \ldots\)
10. \(40 + 35 = \ldots\)
11. \(16 + 40 = \ldots\)
12. \(27 + 22 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 50 + 32\\= &50 + \color{green}{30} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
2. \(\begin{align} & 69 + 20\\= &20+69\\= &20 + \color{green}{60} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
3. \(\begin{align} & 19 + 60\\= &60+19\\= &60 + \color{green}{10} + \color{red}{9} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
4. \(\begin{align} & 86 + 11\\= & \color{green}{80} + \color{red}{6} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
5. \(\begin{align} & 22 + 35\\= & \color{green}{20} + \color{red}{2} + \color{green}{30} + \color{red}{5} \\= & \color{green}{50} + \color{red}{7} \\= & \color{red}{57} \end{align}\)
6. \(\begin{align} & 66 + 21\\= & \color{green}{60} + \color{red}{6} + \color{green}{20} + \color{red}{1} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
7. \(\begin{align} & 60 + 35\\= &60 + \color{green}{30} + \color{red}{5} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
8. \(\begin{align} & 19 + 20\\= &20+19\\= &20 + \color{green}{10} + \color{red}{9} \\= & \color{green}{30} + \color{red}{9} \\= & \color{red}{39} \end{align}\)
9. \(\begin{align} & 73 + 24\\= & \color{green}{70} + \color{red}{3} + \color{green}{20} + \color{red}{4} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
10. \(\begin{align} & 40 + 35\\= &40 + \color{green}{30} + \color{red}{5} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
11. \(\begin{align} & 16 + 40\\= &40+16\\= &40 + \color{green}{10} + \color{red}{6} \\= & \color{green}{50} + \color{red}{6} \\= & \color{red}{56} \end{align}\)
12. \(\begin{align} & 27 + 22\\= & \color{green}{20} + \color{red}{7} + \color{green}{20} + \color{red}{2} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)