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1. \(9 + 82 = \ldots\)
2. \(38 + 6 = \ldots\)
3. \(35 + 7 = \ldots\)
4. \(6 + 16 = \ldots\)
5. \(9 + 72 = \ldots\)
6. \(83 + 8 = \ldots\)
7. \(4 + 38 = \ldots\)
8. \(68 + 4 = \ldots\)
9. \(7 + 64 = \ldots\)
10. \(5 + 56 = \ldots\)
11. \(9 + 62 = \ldots\)
12. \(7 + 74 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 9 + 82 \\= & 82 + 9 \\= & 82 + \color{green}{8} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
2. \(\begin{align} & 38 + 6 \\= & 38 + \color{green}{2} + \color{red}{4} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
3. \(\begin{align} & 35 + 7 \\= & 35 + \color{green}{5} + \color{red}{2} \\= & \color{green}{40} + \color{red}{2} \\= & \color{red}{42} \end{align}\)
4. \(\begin{align} & 6 + 16 \\= & 16 + 6 \\= & 16 + \color{green}{4} + \color{red}{2} \\= & \color{green}{20} + \color{red}{2} \\= & \color{red}{22} \end{align}\)
5. \(\begin{align} & 9 + 72 \\= & 72 + 9 \\= & 72 + \color{green}{8} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
6. \(\begin{align} & 83 + 8 \\= & 83 + \color{green}{7} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
7. \(\begin{align} & 4 + 38 \\= & 38 + 4 \\= & 38 + \color{green}{2} + \color{red}{2} \\= & \color{green}{40} + \color{red}{2} \\= & \color{red}{42} \end{align}\)
8. \(\begin{align} & 68 + 4 \\= & 68 + \color{green}{2} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
9. \(\begin{align} & 7 + 64 \\= & 64 + 7 \\= & 64 + \color{green}{6} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
10. \(\begin{align} & 5 + 56 \\= & 56 + 5 \\= & 56 + \color{green}{4} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
11. \(\begin{align} & 9 + 62 \\= & 62 + 9 \\= & 62 + \color{green}{8} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
12. \(\begin{align} & 7 + 74 \\= & 74 + 7 \\= & 74 + \color{green}{6} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)