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1. \(27 + 62 = \ldots\)
2. \(67 + 30 = \ldots\)
3. \(17 + 22 = \ldots\)
4. \(66 + 33 = \ldots\)
5. \(47 + 40 = \ldots\)
6. \(27 + 21 = \ldots\)
7. \(82 + 11 = \ldots\)
8. \(32 + 43 = \ldots\)
9. \(82 + 17 = \ldots\)
10. \(86 + 11 = \ldots\)
11. \(45 + 14 = \ldots\)
12. \(64 + 30 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 27 + 62\\= & \color{green}{20} + \color{red}{7} + \color{green}{60} + \color{red}{2} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
2. \(\begin{align} & 67 + 30\\= &30+67\\= &30 + \color{green}{60} + \color{red}{7} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
3. \(\begin{align} & 17 + 22\\= & \color{green}{10} + \color{red}{7} + \color{green}{20} + \color{red}{2} \\= & \color{green}{30} + \color{red}{9} \\= & \color{red}{39} \end{align}\)
4. \(\begin{align} & 66 + 33\\= & \color{green}{60} + \color{red}{6} + \color{green}{30} + \color{red}{3} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
5. \(\begin{align} & 47 + 40\\= &40+47\\= &40 + \color{green}{40} + \color{red}{7} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
6. \(\begin{align} & 27 + 21\\= & \color{green}{20} + \color{red}{7} + \color{green}{20} + \color{red}{1} \\= & \color{green}{40} + \color{red}{8} \\= & \color{red}{48} \end{align}\)
7. \(\begin{align} & 82 + 11\\= & \color{green}{80} + \color{red}{2} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
8. \(\begin{align} & 32 + 43\\= & \color{green}{30} + \color{red}{2} + \color{green}{40} + \color{red}{3} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
9. \(\begin{align} & 82 + 17\\= & \color{green}{80} + \color{red}{2} + \color{green}{10} + \color{red}{7} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
10. \(\begin{align} & 86 + 11\\= & \color{green}{80} + \color{red}{6} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
11. \(\begin{align} & 45 + 14\\= & \color{green}{40} + \color{red}{5} + \color{green}{10} + \color{red}{4} \\= & \color{green}{50} + \color{red}{9} \\= & \color{red}{59} \end{align}\)
12. \(\begin{align} & 64 + 30\\= &30+64\\= &30 + \color{green}{60} + \color{red}{4} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)