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1. \(50 + 48 = \ldots\)
2. \(35 + 12 = \ldots\)
3. \(69 + 30 = \ldots\)
4. \(50 + 10 = \ldots\)
5. \(78 + 11 = \ldots\)
6. \(47 + 10 = \ldots\)
7. \(33 + 60 = \ldots\)
8. \(44 + 14 = \ldots\)
9. \(19 + 30 = \ldots\)
10. \(29 + 20 = \ldots\)
11. \(83 + 16 = \ldots\)
12. \(29 + 40 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 50 + 48\\= &50 + \color{green}{40} + \color{red}{8} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
2. \(\begin{align} & 35 + 12\\= & \color{green}{30} + \color{red}{5} + \color{green}{10} + \color{red}{2} \\= & \color{green}{40} + \color{red}{7} \\= & \color{red}{47} \end{align}\)
3. \(\begin{align} & 69 + 30\\= &30+69\\= &30 + \color{green}{60} + \color{red}{9} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
4. \(\begin{align} & 50 + 10\\= &50 + \color{green}{10} + \color{red}{0} \\= & \color{green}{60} + \color{red}{0} \\= & \color{red}{60} \end{align}\)
5. \(\begin{align} & 78 + 11\\= & \color{green}{70} + \color{red}{8} + \color{green}{10} + \color{red}{1} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
6. \(\begin{align} & 47 + 10\\= &10+47\\= &10 + \color{green}{40} + \color{red}{7} \\= & \color{green}{50} + \color{red}{7} \\= & \color{red}{57} \end{align}\)
7. \(\begin{align} & 33 + 60\\= &60+33\\= &60 + \color{green}{30} + \color{red}{3} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
8. \(\begin{align} & 44 + 14\\= & \color{green}{40} + \color{red}{4} + \color{green}{10} + \color{red}{4} \\= & \color{green}{50} + \color{red}{8} \\= & \color{red}{58} \end{align}\)
9. \(\begin{align} & 19 + 30\\= &30+19\\= &30 + \color{green}{10} + \color{red}{9} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)
10. \(\begin{align} & 29 + 20\\= &20+29\\= &20 + \color{green}{20} + \color{red}{9} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)
11. \(\begin{align} & 83 + 16\\= & \color{green}{80} + \color{red}{3} + \color{green}{10} + \color{red}{6} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
12. \(\begin{align} & 29 + 40\\= &40+29\\= &40 + \color{green}{20} + \color{red}{9} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)