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1. \(65 + 31 = \ldots\)
2. \(50 + 11 = \ldots\)
3. \(54 + 12 = \ldots\)
4. \(82 + 14 = \ldots\)
5. \(66 + 10 = \ldots\)
6. \(15 + 84 = \ldots\)
7. \(45 + 11 = \ldots\)
8. \(84 + 15 = \ldots\)
9. \(66 + 31 = \ldots\)
10. \(42 + 14 = \ldots\)
11. \(60 + 24 = \ldots\)
12. \(64 + 20 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 65 + 31\\= & \color{green}{60} + \color{red}{5} + \color{green}{30} + \color{red}{1} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
2. \(\begin{align} & 50 + 11\\= &50 + \color{green}{10} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
3. \(\begin{align} & 54 + 12\\= & \color{green}{50} + \color{red}{4} + \color{green}{10} + \color{red}{2} \\= & \color{green}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)
4. \(\begin{align} & 82 + 14\\= & \color{green}{80} + \color{red}{2} + \color{green}{10} + \color{red}{4} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
5. \(\begin{align} & 66 + 10\\= &10+66\\= &10 + \color{green}{60} + \color{red}{6} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)
6. \(\begin{align} & 15 + 84\\= & \color{green}{10} + \color{red}{5} + \color{green}{80} + \color{red}{4} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
7. \(\begin{align} & 45 + 11\\= & \color{green}{40} + \color{red}{5} + \color{green}{10} + \color{red}{1} \\= & \color{green}{50} + \color{red}{6} \\= & \color{red}{56} \end{align}\)
8. \(\begin{align} & 84 + 15\\= & \color{green}{80} + \color{red}{4} + \color{green}{10} + \color{red}{5} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
9. \(\begin{align} & 66 + 31\\= & \color{green}{60} + \color{red}{6} + \color{green}{30} + \color{red}{1} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
10. \(\begin{align} & 42 + 14\\= & \color{green}{40} + \color{red}{2} + \color{green}{10} + \color{red}{4} \\= & \color{green}{50} + \color{red}{6} \\= & \color{red}{56} \end{align}\)
11. \(\begin{align} & 60 + 24\\= &60 + \color{green}{20} + \color{red}{4} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
12. \(\begin{align} & 64 + 20\\= &20+64\\= &20 + \color{green}{60} + \color{red}{4} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)