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1. \(8 + 26 = \ldots\)
2. \(9 + 52 = \ldots\)
3. \(7 + 27 = \ldots\)
4. \(53 + 9 = \ldots\)
5. \(17 + 7 = \ldots\)
6. \(8 + 36 = \ldots\)
7. \(14 + 9 = \ldots\)
8. \(9 + 66 = \ldots\)
9. \(7 + 74 = \ldots\)
10. \(7 + 85 = \ldots\)
11. \(5 + 28 = \ldots\)
12. \(5 + 29 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 8 + 26 \\= & 26 + 8 \\= & 26 + \color{green}{4} + \color{red}{4} \\= & \color{green}{30} + \color{red}{4} \\= & \color{red}{34} \end{align}\)
2. \(\begin{align} & 9 + 52 \\= & 52 + 9 \\= & 52 + \color{green}{8} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
3. \(\begin{align} & 7 + 27 \\= & 27 + 7 \\= & 27 + \color{green}{3} + \color{red}{4} \\= & \color{green}{30} + \color{red}{4} \\= & \color{red}{34} \end{align}\)
4. \(\begin{align} & 53 + 9 \\= & 53 + \color{green}{7} + \color{red}{2} \\= & \color{green}{60} + \color{red}{2} \\= & \color{red}{62} \end{align}\)
5. \(\begin{align} & 17 + 7 \\= & 17 + \color{green}{3} + \color{red}{4} \\= & \color{green}{20} + \color{red}{4} \\= & \color{red}{24} \end{align}\)
6. \(\begin{align} & 8 + 36 \\= & 36 + 8 \\= & 36 + \color{green}{4} + \color{red}{4} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
7. \(\begin{align} & 14 + 9 \\= & 14 + \color{green}{6} + \color{red}{3} \\= & \color{green}{20} + \color{red}{3} \\= & \color{red}{23} \end{align}\)
8. \(\begin{align} & 9 + 66 \\= & 66 + 9 \\= & 66 + \color{green}{4} + \color{red}{5} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
9. \(\begin{align} & 7 + 74 \\= & 74 + 7 \\= & 74 + \color{green}{6} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
10. \(\begin{align} & 7 + 85 \\= & 85 + 7 \\= & 85 + \color{green}{5} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
11. \(\begin{align} & 5 + 28 \\= & 28 + 5 \\= & 28 + \color{green}{2} + \color{red}{3} \\= & \color{green}{30} + \color{red}{3} \\= & \color{red}{33} \end{align}\)
12. \(\begin{align} & 5 + 29 \\= & 29 + 5 \\= & 29 + \color{green}{1} + \color{red}{4} \\= & \color{green}{30} + \color{red}{4} \\= & \color{red}{34} \end{align}\)