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1. \(7 + 58 = \ldots\)
2. \(8 + 43 = \ldots\)
3. \(75 + 9 = \ldots\)
4. \(57 + 6 = \ldots\)
5. \(7 + 14 = \ldots\)
6. \(7 + 48 = \ldots\)
7. \(59 + 2 = \ldots\)
8. \(28 + 3 = \ldots\)
9. \(5 + 69 = \ldots\)
10. \(3 + 59 = \ldots\)
11. \(9 + 82 = \ldots\)
12. \(72 + 9 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 7 + 58 \\= & 58 + 7 \\= & 58 + \color{green}{2} + \color{red}{5} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
2. \(\begin{align} & 8 + 43 \\= & 43 + 8 \\= & 43 + \color{green}{7} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
3. \(\begin{align} & 75 + 9 \\= & 75 + \color{green}{5} + \color{red}{4} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
4. \(\begin{align} & 57 + 6 \\= & 57 + \color{green}{3} + \color{red}{3} \\= & \color{green}{60} + \color{red}{3} \\= & \color{red}{63} \end{align}\)
5. \(\begin{align} & 7 + 14 \\= & 14 + 7 \\= & 14 + \color{green}{6} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
6. \(\begin{align} & 7 + 48 \\= & 48 + 7 \\= & 48 + \color{green}{2} + \color{red}{5} \\= & \color{green}{50} + \color{red}{5} \\= & \color{red}{55} \end{align}\)
7. \(\begin{align} & 59 + 2 \\= & 59 + \color{green}{1} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
8. \(\begin{align} & 28 + 3 \\= & 28 + \color{green}{2} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
9. \(\begin{align} & 5 + 69 \\= & 69 + 5 \\= & 69 + \color{green}{1} + \color{red}{4} \\= & \color{green}{70} + \color{red}{4} \\= & \color{red}{74} \end{align}\)
10. \(\begin{align} & 3 + 59 \\= & 59 + 3 \\= & 59 + \color{green}{1} + \color{red}{2} \\= & \color{green}{60} + \color{red}{2} \\= & \color{red}{62} \end{align}\)
11. \(\begin{align} & 9 + 82 \\= & 82 + 9 \\= & 82 + \color{green}{8} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
12. \(\begin{align} & 72 + 9 \\= & 72 + \color{green}{8} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)