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1. \(9 + 39 = \ldots\)
2. \(9 + 12 = \ldots\)
3. \(6 + 38 = \ldots\)
4. \(8 + 63 = \ldots\)
5. \(7 + 64 = \ldots\)
6. \(86 + 9 = \ldots\)
7. \(82 + 9 = \ldots\)
8. \(62 + 9 = \ldots\)
9. \(39 + 9 = \ldots\)
10. \(8 + 36 = \ldots\)
11. \(14 + 8 = \ldots\)
12. \(6 + 26 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 9 + 39 \\= & 39 + 9 \\= & 39 + \color{green}{1} + \color{red}{8} \\= & \color{green}{40} + \color{red}{8} \\= & \color{red}{48} \end{align}\)
2. \(\begin{align} & 9 + 12 \\= & 12 + 9 \\= & 12 + \color{green}{8} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
3. \(\begin{align} & 6 + 38 \\= & 38 + 6 \\= & 38 + \color{green}{2} + \color{red}{4} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
4. \(\begin{align} & 8 + 63 \\= & 63 + 8 \\= & 63 + \color{green}{7} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
5. \(\begin{align} & 7 + 64 \\= & 64 + 7 \\= & 64 + \color{green}{6} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
6. \(\begin{align} & 86 + 9 \\= & 86 + \color{green}{4} + \color{red}{5} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
7. \(\begin{align} & 82 + 9 \\= & 82 + \color{green}{8} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
8. \(\begin{align} & 62 + 9 \\= & 62 + \color{green}{8} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
9. \(\begin{align} & 39 + 9 \\= & 39 + \color{green}{1} + \color{red}{8} \\= & \color{green}{40} + \color{red}{8} \\= & \color{red}{48} \end{align}\)
10. \(\begin{align} & 8 + 36 \\= & 36 + 8 \\= & 36 + \color{green}{4} + \color{red}{4} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
11. \(\begin{align} & 14 + 8 \\= & 14 + \color{green}{6} + \color{red}{2} \\= & \color{green}{20} + \color{red}{2} \\= & \color{red}{22} \end{align}\)
12. \(\begin{align} & 6 + 26 \\= & 26 + 6 \\= & 26 + \color{green}{4} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}\)