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1. \(57 + 12 = \ldots\)
2. \(67 + 32 = \ldots\)
3. \(88 + 11 = \ldots\)
4. \(69 + 20 = \ldots\)
5. \(66 + 13 = \ldots\)
6. \(74 + 13 = \ldots\)
7. \(56 + 11 = \ldots\)
8. \(66 + 30 = \ldots\)
9. \(50 + 11 = \ldots\)
10. \(84 + 11 = \ldots\)
11. \(45 + 32 = \ldots\)
12. \(42 + 26 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 57 + 12\\= & \color{green}{50} + \color{red}{7} + \color{green}{10} + \color{red}{2} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
2. \(\begin{align} & 67 + 32\\= & \color{green}{60} + \color{red}{7} + \color{green}{30} + \color{red}{2} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
3. \(\begin{align} & 88 + 11\\= & \color{green}{80} + \color{red}{8} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
4. \(\begin{align} & 69 + 20\\= &20+69\\= &20 + \color{green}{60} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
5. \(\begin{align} & 66 + 13\\= & \color{green}{60} + \color{red}{6} + \color{green}{10} + \color{red}{3} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
6. \(\begin{align} & 74 + 13\\= & \color{green}{70} + \color{red}{4} + \color{green}{10} + \color{red}{3} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
7. \(\begin{align} & 56 + 11\\= & \color{green}{50} + \color{red}{6} + \color{green}{10} + \color{red}{1} \\= & \color{green}{60} + \color{red}{7} \\= & \color{red}{67} \end{align}\)
8. \(\begin{align} & 66 + 30\\= &30+66\\= &30 + \color{green}{60} + \color{red}{6} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
9. \(\begin{align} & 50 + 11\\= &50 + \color{green}{10} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
10. \(\begin{align} & 84 + 11\\= & \color{green}{80} + \color{red}{4} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
11. \(\begin{align} & 45 + 32\\= & \color{green}{40} + \color{red}{5} + \color{green}{30} + \color{red}{2} \\= & \color{green}{70} + \color{red}{7} \\= & \color{red}{77} \end{align}\)
12. \(\begin{align} & 42 + 26\\= & \color{green}{40} + \color{red}{2} + \color{green}{20} + \color{red}{6} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)