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1. \(9 + 32 = \ldots\)
2. \(77 + 8 = \ldots\)
3. \(82 + 9 = \ldots\)
4. \(55 + 9 = \ldots\)
5. \(7 + 86 = \ldots\)
6. \(6 + 76 = \ldots\)
7. \(6 + 66 = \ldots\)
8. \(6 + 78 = \ldots\)
9. \(89 + 9 = \ldots\)
10. \(54 + 7 = \ldots\)
11. \(33 + 8 = \ldots\)
12. \(26 + 8 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 9 + 32 \\= & 32 + 9 \\= & 32 + \color{green}{8} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
2. \(\begin{align} & 77 + 8 \\= & 77 + \color{green}{3} + \color{red}{5} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
3. \(\begin{align} & 82 + 9 \\= & 82 + \color{green}{8} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
4. \(\begin{align} & 55 + 9 \\= & 55 + \color{green}{5} + \color{red}{4} \\= & \color{green}{60} + \color{red}{4} \\= & \color{red}{64} \end{align}\)
5. \(\begin{align} & 7 + 86 \\= & 86 + 7 \\= & 86 + \color{green}{4} + \color{red}{3} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
6. \(\begin{align} & 6 + 76 \\= & 76 + 6 \\= & 76 + \color{green}{4} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
7. \(\begin{align} & 6 + 66 \\= & 66 + 6 \\= & 66 + \color{green}{4} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
8. \(\begin{align} & 6 + 78 \\= & 78 + 6 \\= & 78 + \color{green}{2} + \color{red}{4} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
9. \(\begin{align} & 89 + 9 \\= & 89 + \color{green}{1} + \color{red}{8} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
10. \(\begin{align} & 54 + 7 \\= & 54 + \color{green}{6} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
11. \(\begin{align} & 33 + 8 \\= & 33 + \color{green}{7} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
12. \(\begin{align} & 26 + 8 \\= & 26 + \color{green}{4} + \color{red}{4} \\= & \color{green}{30} + \color{red}{4} \\= & \color{red}{34} \end{align}\)