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1. \(41 + 30 = \ldots\)
2. \(59 + 10 = \ldots\)
3. \(20 + 71 = \ldots\)
4. \(50 + 35 = \ldots\)
5. \(10 + 88 = \ldots\)
6. \(60 + 38 = \ldots\)
7. \(14 + 40 = \ldots\)
8. \(35 + 60 = \ldots\)
9. \(59 + 40 = \ldots\)
10. \(17 + 60 = \ldots\)
11. \(60 + 23 = \ldots\)
12. \(83 + 10 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 41 + 30 \\ = & 30 + 41 \\= & 30 + \color{green}{40} + \color{red}{1} \\ = & \color{green}{70} + \color{red}{1} \\ = & \color{red}{71} \end{align}\)
2. \(\begin{align} & 59 + 10 \\ = & 10 + 59 \\= & 10 + \color{green}{50} + \color{red}{9} \\ = & \color{green}{60} + \color{red}{9} \\ = & \color{red}{69} \end{align}\)
3. \(\begin{align} & 20 + 71 \\= & 20 + \color{green}{70} + \color{red}{1} \\ = & \color{green}{90} + \color{red}{1} \\ = & \color{red}{91} \end{align}\)
4. \(\begin{align} & 50 + 35 \\= & 50 + \color{green}{30} + \color{red}{5} \\ = & \color{green}{80} + \color{red}{5} \\ = & \color{red}{85} \end{align}\)
5. \(\begin{align} & 10 + 88 \\= & 10 + \color{green}{80} + \color{red}{8} \\ = & \color{green}{90} + \color{red}{8} \\ = & \color{red}{98} \end{align}\)
6. \(\begin{align} & 60 + 38 \\= & 60 + \color{green}{30} + \color{red}{8} \\ = & \color{green}{90} + \color{red}{8} \\ = & \color{red}{98} \end{align}\)
7. \(\begin{align} & 14 + 40 \\ = & 40 + 14 \\= & 40 + \color{green}{10} + \color{red}{4} \\ = & \color{green}{50} + \color{red}{4} \\ = & \color{red}{54} \end{align}\)
8. \(\begin{align} & 35 + 60 \\ = & 60 + 35 \\= & 60 + \color{green}{30} + \color{red}{5} \\ = & \color{green}{90} + \color{red}{5} \\ = & \color{red}{95} \end{align}\)
9. \(\begin{align} & 59 + 40 \\ = & 40 + 59 \\= & 40 + \color{green}{50} + \color{red}{9} \\ = & \color{green}{90} + \color{red}{9} \\ = & \color{red}{99} \end{align}\)
10. \(\begin{align} & 17 + 60 \\ = & 60 + 17 \\= & 60 + \color{green}{10} + \color{red}{7} \\ = & \color{green}{70} + \color{red}{7} \\ = & \color{red}{77} \end{align}\)
11. \(\begin{align} & 60 + 23 \\= & 60 + \color{green}{20} + \color{red}{3} \\ = & \color{green}{80} + \color{red}{3} \\ = & \color{red}{83} \end{align}\)
12. \(\begin{align} & 83 + 10 \\ = & 10 + 83 \\= & 10 + \color{green}{80} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}\)