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1. \(12 + 53 = \ldots\)
2. \(88 + 11 = \ldots\)
3. \(72 + 20 = \ldots\)
4. \(29 + 40 = \ldots\)
5. \(78 + 21 = \ldots\)
6. \(79 + 20 = \ldots\)
7. \(19 + 70 = \ldots\)
8. \(82 + 17 = \ldots\)
9. \(11 + 80 = \ldots\)
10. \(43 + 22 = \ldots\)
11. \(23 + 11 = \ldots\)
12. \(31 + 67 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 12 + 53\\= & \color{green}{10} + \color{red}{2} + \color{green}{50} + \color{red}{3} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
2. \(\begin{align} & 88 + 11\\= & \color{green}{80} + \color{red}{8} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
3. \(\begin{align} & 72 + 20\\= &20+72\\= &20 + \color{green}{70} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
4. \(\begin{align} & 29 + 40\\= &40+29\\= &40 + \color{green}{20} + \color{red}{9} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
5. \(\begin{align} & 78 + 21\\= & \color{green}{70} + \color{red}{8} + \color{green}{20} + \color{red}{1} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
6. \(\begin{align} & 79 + 20\\= &20+79\\= &20 + \color{green}{70} + \color{red}{9} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
7. \(\begin{align} & 19 + 70\\= &70+19\\= &70 + \color{green}{10} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
8. \(\begin{align} & 82 + 17\\= & \color{green}{80} + \color{red}{2} + \color{green}{10} + \color{red}{7} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
9. \(\begin{align} & 11 + 80\\= &80+11\\= &80 + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
10. \(\begin{align} & 43 + 22\\= & \color{green}{40} + \color{red}{3} + \color{green}{20} + \color{red}{2} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
11. \(\begin{align} & 23 + 11\\= & \color{green}{20} + \color{red}{3} + \color{green}{10} + \color{red}{1} \\= & \color{green}{30} + \color{red}{4} \\= & \color{red}{34} \end{align}\)
12. \(\begin{align} & 31 + 67\\= & \color{green}{30} + \color{red}{1} + \color{green}{60} + \color{red}{7} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)