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1. \(10 + 51 = \ldots\)
2. \(11 + 70 = \ldots\)
3. \(17 + 20 = \ldots\)
4. \(30 + 16 = \ldots\)
5. \(58 + 10 = \ldots\)
6. \(37 + 50 = \ldots\)
7. \(10 + 46 = \ldots\)
8. \(10 + 69 = \ldots\)
9. \(10 + 98 = \ldots\)
10. \(10 + 82 = \ldots\)
11. \(44 + 50 = \ldots\)
12. \(50 + 26 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 10 + 51 \\= & 10 + \color{green}{50} + \color{red}{1} \\ = & \color{green}{60} + \color{red}{1} \\ = & \color{red}{61} \end{align}\)
2. \(\begin{align} & 11 + 70 \\ = & 70 + 11 \\= & 70 + \color{green}{10} + \color{red}{1} \\ = & \color{green}{80} + \color{red}{1} \\ = & \color{red}{81} \end{align}\)
3. \(\begin{align} & 17 + 20 \\ = & 20 + 17 \\= & 20 + \color{green}{10} + \color{red}{7} \\ = & \color{green}{30} + \color{red}{7} \\ = & \color{red}{37} \end{align}\)
4. \(\begin{align} & 30 + 16 \\= & 30 + \color{green}{10} + \color{red}{6} \\ = & \color{green}{40} + \color{red}{6} \\ = & \color{red}{46} \end{align}\)
5. \(\begin{align} & 58 + 10 \\ = & 10 + 58 \\= & 10 + \color{green}{50} + \color{red}{8} \\ = & \color{green}{60} + \color{red}{8} \\ = & \color{red}{68} \end{align}\)
6. \(\begin{align} & 37 + 50 \\ = & 50 + 37 \\= & 50 + \color{green}{30} + \color{red}{7} \\ = & \color{green}{80} + \color{red}{7} \\ = & \color{red}{87} \end{align}\)
7. \(\begin{align} & 10 + 46 \\= & 10 + \color{green}{40} + \color{red}{6} \\ = & \color{green}{50} + \color{red}{6} \\ = & \color{red}{56} \end{align}\)
8. \(\begin{align} & 10 + 69 \\= & 10 + \color{green}{60} + \color{red}{9} \\ = & \color{green}{70} + \color{red}{9} \\ = & \color{red}{79} \end{align}\)
9. \(\begin{align} & 10 + 98 \\= & 10 + \color{green}{90} + \color{red}{8} \\ = & \color{green}{100} + \color{red}{8} \\ = & \color{red}{108} \end{align}\)
10. \(\begin{align} & 10 + 82 \\= & 10 + \color{green}{80} + \color{red}{2} \\ = & \color{green}{90} + \color{red}{2} \\ = & \color{red}{92} \end{align}\)
11. \(\begin{align} & 44 + 50 \\ = & 50 + 44 \\= & 50 + \color{green}{40} + \color{red}{4} \\ = & \color{green}{90} + \color{red}{4} \\ = & \color{red}{94} \end{align}\)
12. \(\begin{align} & 50 + 26 \\= & 50 + \color{green}{20} + \color{red}{6} \\ = & \color{green}{70} + \color{red}{6} \\ = & \color{red}{76} \end{align}\)