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1. \(54 + 11 = \ldots\)
2. \(33 + 40 = \ldots\)
3. \(41 + 53 = \ldots\)
4. \(13 + 74 = \ldots\)
5. \(31 + 35 = \ldots\)
6. \(70 + 25 = \ldots\)
7. \(52 + 24 = \ldots\)
8. \(50 + 10 = \ldots\)
9. \(74 + 20 = \ldots\)
10. \(52 + 34 = \ldots\)
11. \(60 + 35 = \ldots\)
12. \(43 + 43 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 54 + 11\\= & \color{green}{50} + \color{red}{4} + \color{green}{10} + \color{red}{1} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
2. \(\begin{align} & 33 + 40\\= &40+33\\= &40 + \color{green}{30} + \color{red}{3} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
3. \(\begin{align} & 41 + 53\\= & \color{green}{40} + \color{red}{1} + \color{green}{50} + \color{red}{3} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
4. \(\begin{align} & 13 + 74\\= & \color{green}{10} + \color{red}{3} + \color{green}{70} + \color{red}{4} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
5. \(\begin{align} & 31 + 35\\= & \color{green}{30} + \color{red}{1} + \color{green}{30} + \color{red}{5} \\= & \color{green}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)
6. \(\begin{align} & 70 + 25\\= &70 + \color{green}{20} + \color{red}{5} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
7. \(\begin{align} & 52 + 24\\= & \color{green}{50} + \color{red}{2} + \color{green}{20} + \color{red}{4} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)
8. \(\begin{align} & 50 + 10\\= &50 + \color{green}{10} + \color{red}{0} \\= & \color{green}{60} + \color{red}{0} \\= & \color{red}{60} \end{align}\)
9. \(\begin{align} & 74 + 20\\= &20+74\\= &20 + \color{green}{70} + \color{red}{4} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
10. \(\begin{align} & 52 + 34\\= & \color{green}{50} + \color{red}{2} + \color{green}{30} + \color{red}{4} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
11. \(\begin{align} & 60 + 35\\= &60 + \color{green}{30} + \color{red}{5} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
12. \(\begin{align} & 43 + 43\\= & \color{green}{40} + \color{red}{3} + \color{green}{40} + \color{red}{3} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)