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1. \(4 + 58 = \ldots\)
2. \(64 + 9 = \ldots\)
3. \(8 + 79 = \ldots\)
4. \(89 + 2 = \ldots\)
5. \(5 + 27 = \ldots\)
6. \(25 + 8 = \ldots\)
7. \(57 + 8 = \ldots\)
8. \(83 + 8 = \ldots\)
9. \(2 + 59 = \ldots\)
10. \(37 + 5 = \ldots\)
11. \(9 + 72 = \ldots\)
12. \(66 + 7 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 4 + 58 \\= & 58 + 4 \\= & 58 + \color{green}{2} + \color{red}{2} \\= & \color{green}{60} + \color{red}{2} \\= & \color{red}{62} \end{align}\)
2. \(\begin{align} & 64 + 9 \\= & 64 + \color{green}{6} + \color{red}{3} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
3. \(\begin{align} & 8 + 79 \\= & 79 + 8 \\= & 79 + \color{green}{1} + \color{red}{7} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
4. \(\begin{align} & 89 + 2 \\= & 89 + \color{green}{1} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
5. \(\begin{align} & 5 + 27 \\= & 27 + 5 \\= & 27 + \color{green}{3} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}\)
6. \(\begin{align} & 25 + 8 \\= & 25 + \color{green}{5} + \color{red}{3} \\= & \color{green}{30} + \color{red}{3} \\= & \color{red}{33} \end{align}\)
7. \(\begin{align} & 57 + 8 \\= & 57 + \color{green}{3} + \color{red}{5} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
8. \(\begin{align} & 83 + 8 \\= & 83 + \color{green}{7} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
9. \(\begin{align} & 2 + 59 \\= & 59 + 2 \\= & 59 + \color{green}{1} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
10. \(\begin{align} & 37 + 5 \\= & 37 + \color{green}{3} + \color{red}{2} \\= & \color{green}{40} + \color{red}{2} \\= & \color{red}{42} \end{align}\)
11. \(\begin{align} & 9 + 72 \\= & 72 + 9 \\= & 72 + \color{green}{8} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
12. \(\begin{align} & 66 + 7 \\= & 66 + \color{green}{4} + \color{red}{3} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)