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1. \(52 + 9 = \ldots\)
2. \(82 + 9 = \ldots\)
3. \(29 + 8 = \ldots\)
4. \(9 + 23 = \ldots\)
5. \(55 + 8 = \ldots\)
6. \(16 + 7 = \ldots\)
7. \(13 + 9 = \ldots\)
8. \(37 + 9 = \ldots\)
9. \(83 + 8 = \ldots\)
10. \(25 + 8 = \ldots\)
11. \(23 + 9 = \ldots\)
12. \(64 + 7 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 52 + 9 \\= & 52 + \color{green}{8} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
2. \(\begin{align} & 82 + 9 \\= & 82 + \color{green}{8} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
3. \(\begin{align} & 29 + 8 \\= & 29 + \color{green}{1} + \color{red}{7} \\= & \color{green}{30} + \color{red}{7} \\= & \color{red}{37} \end{align}\)
4. \(\begin{align} & 9 + 23 \\= & 23 + 9 \\= & 23 + \color{green}{7} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}\)
5. \(\begin{align} & 55 + 8 \\= & 55 + \color{green}{5} + \color{red}{3} \\= & \color{green}{60} + \color{red}{3} \\= & \color{red}{63} \end{align}\)
6. \(\begin{align} & 16 + 7 \\= & 16 + \color{green}{4} + \color{red}{3} \\= & \color{green}{20} + \color{red}{3} \\= & \color{red}{23} \end{align}\)
7. \(\begin{align} & 13 + 9 \\= & 13 + \color{green}{7} + \color{red}{2} \\= & \color{green}{20} + \color{red}{2} \\= & \color{red}{22} \end{align}\)
8. \(\begin{align} & 37 + 9 \\= & 37 + \color{green}{3} + \color{red}{6} \\= & \color{green}{40} + \color{red}{6} \\= & \color{red}{46} \end{align}\)
9. \(\begin{align} & 83 + 8 \\= & 83 + \color{green}{7} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
10. \(\begin{align} & 25 + 8 \\= & 25 + \color{green}{5} + \color{red}{3} \\= & \color{green}{30} + \color{red}{3} \\= & \color{red}{33} \end{align}\)
11. \(\begin{align} & 23 + 9 \\= & 23 + \color{green}{7} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}\)
12. \(\begin{align} & 64 + 7 \\= & 64 + \color{green}{6} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)