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1. \(8 + 83 = \ldots\)
2. \(8 + 14 = \ldots\)
3. \(8 + 23 = \ldots\)
4. \(84 + 9 = \ldots\)
5. \(7 + 35 = \ldots\)
6. \(78 + 7 = \ldots\)
7. \(9 + 12 = \ldots\)
8. \(46 + 5 = \ldots\)
9. \(72 + 9 = \ldots\)
10. \(7 + 57 = \ldots\)
11. \(56 + 5 = \ldots\)
12. \(8 + 33 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 8 + 83 \\= & 83 + 8 \\= & 83 + \color{green}{7} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
2. \(\begin{align} & 8 + 14 \\= & 14 + 8 \\= & 14 + \color{green}{6} + \color{red}{2} \\= & \color{green}{20} + \color{red}{2} \\= & \color{red}{22} \end{align}\)
3. \(\begin{align} & 8 + 23 \\= & 23 + 8 \\= & 23 + \color{green}{7} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
4. \(\begin{align} & 84 + 9 \\= & 84 + \color{green}{6} + \color{red}{3} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
5. \(\begin{align} & 7 + 35 \\= & 35 + 7 \\= & 35 + \color{green}{5} + \color{red}{2} \\= & \color{green}{40} + \color{red}{2} \\= & \color{red}{42} \end{align}\)
6. \(\begin{align} & 78 + 7 \\= & 78 + \color{green}{2} + \color{red}{5} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
7. \(\begin{align} & 9 + 12 \\= & 12 + 9 \\= & 12 + \color{green}{8} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
8. \(\begin{align} & 46 + 5 \\= & 46 + \color{green}{4} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
9. \(\begin{align} & 72 + 9 \\= & 72 + \color{green}{8} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
10. \(\begin{align} & 7 + 57 \\= & 57 + 7 \\= & 57 + \color{green}{3} + \color{red}{4} \\= & \color{green}{60} + \color{red}{4} \\= & \color{red}{64} \end{align}\)
11. \(\begin{align} & 56 + 5 \\= & 56 + \color{green}{4} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
12. \(\begin{align} & 8 + 33 \\= & 33 + 8 \\= & 33 + \color{green}{7} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)