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1. \(55 + 7 = \ldots\)
2. \(53 + 8 = \ldots\)
3. \(8 + 64 = \ldots\)
4. \(32 + 9 = \ldots\)
5. \(85 + 8 = \ldots\)
6. \(8 + 38 = \ldots\)
7. \(6 + 46 = \ldots\)
8. \(9 + 13 = \ldots\)
9. \(9 + 37 = \ldots\)
10. \(19 + 3 = \ldots\)
11. \(8 + 45 = \ldots\)
12. \(8 + 89 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 55 + 7 \\= & 55 + \color{green}{5} + \color{red}{2} \\= & \color{green}{60} + \color{red}{2} \\= & \color{red}{62} \end{align}\)
2. \(\begin{align} & 53 + 8 \\= & 53 + \color{green}{7} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
3. \(\begin{align} & 8 + 64 \\= & 64 + 8 \\= & 64 + \color{green}{6} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
4. \(\begin{align} & 32 + 9 \\= & 32 + \color{green}{8} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
5. \(\begin{align} & 85 + 8 \\= & 85 + \color{green}{5} + \color{red}{3} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
6. \(\begin{align} & 8 + 38 \\= & 38 + 8 \\= & 38 + \color{green}{2} + \color{red}{6} \\= & \color{green}{40} + \color{red}{6} \\= & \color{red}{46} \end{align}\)
7. \(\begin{align} & 6 + 46 \\= & 46 + 6 \\= & 46 + \color{green}{4} + \color{red}{2} \\= & \color{green}{50} + \color{red}{2} \\= & \color{red}{52} \end{align}\)
8. \(\begin{align} & 9 + 13 \\= & 13 + 9 \\= & 13 + \color{green}{7} + \color{red}{2} \\= & \color{green}{20} + \color{red}{2} \\= & \color{red}{22} \end{align}\)
9. \(\begin{align} & 9 + 37 \\= & 37 + 9 \\= & 37 + \color{green}{3} + \color{red}{6} \\= & \color{green}{40} + \color{red}{6} \\= & \color{red}{46} \end{align}\)
10. \(\begin{align} & 19 + 3 \\= & 19 + \color{green}{1} + \color{red}{2} \\= & \color{green}{20} + \color{red}{2} \\= & \color{red}{22} \end{align}\)
11. \(\begin{align} & 8 + 45 \\= & 45 + 8 \\= & 45 + \color{green}{5} + \color{red}{3} \\= & \color{green}{50} + \color{red}{3} \\= & \color{red}{53} \end{align}\)
12. \(\begin{align} & 8 + 89 \\= & 89 + 8 \\= & 89 + \color{green}{1} + \color{red}{7} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)