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1. \(32 + 9 = \ldots\)
2. \(7 + 48 = \ldots\)
3. \(8 + 13 = \ldots\)
4. \(69 + 7 = \ldots\)
5. \(49 + 5 = \ldots\)
6. \(6 + 69 = \ldots\)
7. \(9 + 32 = \ldots\)
8. \(53 + 8 = \ldots\)
9. \(9 + 35 = \ldots\)
10. \(9 + 34 = \ldots\)
11. \(5 + 86 = \ldots\)
12. \(9 + 63 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 32 + 9 \\= & 32 + \color{green}{8} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
2. \(\begin{align} & 7 + 48 \\= & 48 + 7 \\= & 48 + \color{green}{2} + \color{red}{5} \\= & \color{green}{50} + \color{red}{5} \\= & \color{red}{55} \end{align}\)
3. \(\begin{align} & 8 + 13 \\= & 13 + 8 \\= & 13 + \color{green}{7} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
4. \(\begin{align} & 69 + 7 \\= & 69 + \color{green}{1} + \color{red}{6} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)
5. \(\begin{align} & 49 + 5 \\= & 49 + \color{green}{1} + \color{red}{4} \\= & \color{green}{50} + \color{red}{4} \\= & \color{red}{54} \end{align}\)
6. \(\begin{align} & 6 + 69 \\= & 69 + 6 \\= & 69 + \color{green}{1} + \color{red}{5} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
7. \(\begin{align} & 9 + 32 \\= & 32 + 9 \\= & 32 + \color{green}{8} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
8. \(\begin{align} & 53 + 8 \\= & 53 + \color{green}{7} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
9. \(\begin{align} & 9 + 35 \\= & 35 + 9 \\= & 35 + \color{green}{5} + \color{red}{4} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
10. \(\begin{align} & 9 + 34 \\= & 34 + 9 \\= & 34 + \color{green}{6} + \color{red}{3} \\= & \color{green}{40} + \color{red}{3} \\= & \color{red}{43} \end{align}\)
11. \(\begin{align} & 5 + 86 \\= & 86 + 5 \\= & 86 + \color{green}{4} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
12. \(\begin{align} & 9 + 63 \\= & 63 + 9 \\= & 63 + \color{green}{7} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)