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1. \(8 + 33 = \ldots\)
2. \(9 + 36 = \ldots\)
3. \(6 + 25 = \ldots\)
4. \(9 + 72 = \ldots\)
5. \(6 + 55 = \ldots\)
6. \(7 + 58 = \ldots\)
7. \(86 + 7 = \ldots\)
8. \(8 + 47 = \ldots\)
9. \(72 + 9 = \ldots\)
10. \(6 + 38 = \ldots\)
11. \(23 + 9 = \ldots\)
12. \(43 + 9 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 8 + 33 \\= & 33 + 8 \\= & 33 + \color{green}{7} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
2. \(\begin{align} & 9 + 36 \\= & 36 + 9 \\= & 36 + \color{green}{4} + \color{red}{5} \\= & \color{green}{40} + \color{red}{5} \\= & \color{red}{45} \end{align}\)
3. \(\begin{align} & 6 + 25 \\= & 25 + 6 \\= & 25 + \color{green}{5} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
4. \(\begin{align} & 9 + 72 \\= & 72 + 9 \\= & 72 + \color{green}{8} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
5. \(\begin{align} & 6 + 55 \\= & 55 + 6 \\= & 55 + \color{green}{5} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
6. \(\begin{align} & 7 + 58 \\= & 58 + 7 \\= & 58 + \color{green}{2} + \color{red}{5} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
7. \(\begin{align} & 86 + 7 \\= & 86 + \color{green}{4} + \color{red}{3} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
8. \(\begin{align} & 8 + 47 \\= & 47 + 8 \\= & 47 + \color{green}{3} + \color{red}{5} \\= & \color{green}{50} + \color{red}{5} \\= & \color{red}{55} \end{align}\)
9. \(\begin{align} & 72 + 9 \\= & 72 + \color{green}{8} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
10. \(\begin{align} & 6 + 38 \\= & 38 + 6 \\= & 38 + \color{green}{2} + \color{red}{4} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
11. \(\begin{align} & 23 + 9 \\= & 23 + \color{green}{7} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}\)
12. \(\begin{align} & 43 + 9 \\= & 43 + \color{green}{7} + \color{red}{2} \\= & \color{green}{50} + \color{red}{2} \\= & \color{red}{52} \end{align}\)