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1. \(22 + 9 = \ldots\)
2. \(58 + 4 = \ldots\)
3. \(24 + 7 = \ldots\)
4. \(83 + 8 = \ldots\)
5. \(6 + 89 = \ldots\)
6. \(6 + 58 = \ldots\)
7. \(9 + 22 = \ldots\)
8. \(9 + 12 = \ldots\)
9. \(9 + 23 = \ldots\)
10. \(18 + 9 = \ldots\)
11. \(9 + 13 = \ldots\)
12. \(4 + 57 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 22 + 9 \\= & 22 + \color{green}{8} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
2. \(\begin{align} & 58 + 4 \\= & 58 + \color{green}{2} + \color{red}{2} \\= & \color{green}{60} + \color{red}{2} \\= & \color{red}{62} \end{align}\)
3. \(\begin{align} & 24 + 7 \\= & 24 + \color{green}{6} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
4. \(\begin{align} & 83 + 8 \\= & 83 + \color{green}{7} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
5. \(\begin{align} & 6 + 89 \\= & 89 + 6 \\= & 89 + \color{green}{1} + \color{red}{5} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
6. \(\begin{align} & 6 + 58 \\= & 58 + 6 \\= & 58 + \color{green}{2} + \color{red}{4} \\= & \color{green}{60} + \color{red}{4} \\= & \color{red}{64} \end{align}\)
7. \(\begin{align} & 9 + 22 \\= & 22 + 9 \\= & 22 + \color{green}{8} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
8. \(\begin{align} & 9 + 12 \\= & 12 + 9 \\= & 12 + \color{green}{8} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
9. \(\begin{align} & 9 + 23 \\= & 23 + 9 \\= & 23 + \color{green}{7} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}\)
10. \(\begin{align} & 18 + 9 \\= & 18 + \color{green}{2} + \color{red}{7} \\= & \color{green}{20} + \color{red}{7} \\= & \color{red}{27} \end{align}\)
11. \(\begin{align} & 9 + 13 \\= & 13 + 9 \\= & 13 + \color{green}{7} + \color{red}{2} \\= & \color{green}{20} + \color{red}{2} \\= & \color{red}{22} \end{align}\)
12. \(\begin{align} & 4 + 57 \\= & 57 + 4 \\= & 57 + \color{green}{3} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)