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1. \(26 + 51 = \ldots\)
2. \(41 + 52 = \ldots\)
3. \(45 + 43 = \ldots\)
4. \(48 + 40 = \ldots\)
5. \(59 + 40 = \ldots\)
6. \(20 + 10 = \ldots\)
7. \(57 + 10 = \ldots\)
8. \(79 + 10 = \ldots\)
9. \(83 + 12 = \ldots\)
10. \(28 + 71 = \ldots\)
11. \(83 + 10 = \ldots\)
12. \(63 + 34 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 26 + 51\\= & \color{green}{20} + \color{red}{6} + \color{green}{50} + \color{red}{1} \\= & \color{green}{70} + \color{red}{7} \\= & \color{red}{77} \end{align}\)
2. \(\begin{align} & 41 + 52\\= & \color{green}{40} + \color{red}{1} + \color{green}{50} + \color{red}{2} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
3. \(\begin{align} & 45 + 43\\= & \color{green}{40} + \color{red}{5} + \color{green}{40} + \color{red}{3} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
4. \(\begin{align} & 48 + 40\\= &40+48\\= &40 + \color{green}{40} + \color{red}{8} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
5. \(\begin{align} & 59 + 40\\= &40+59\\= &40 + \color{green}{50} + \color{red}{9} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
6. \(\begin{align} & 20 + 10\\= &20 + \color{green}{10} + \color{red}{0} \\= & \color{green}{30} + \color{red}{0} \\= & \color{red}{30} \end{align}\)
7. \(\begin{align} & 57 + 10\\= &10+57\\= &10 + \color{green}{50} + \color{red}{7} \\= & \color{green}{60} + \color{red}{7} \\= & \color{red}{67} \end{align}\)
8. \(\begin{align} & 79 + 10\\= &10+79\\= &10 + \color{green}{70} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
9. \(\begin{align} & 83 + 12\\= & \color{green}{80} + \color{red}{3} + \color{green}{10} + \color{red}{2} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
10. \(\begin{align} & 28 + 71\\= & \color{green}{20} + \color{red}{8} + \color{green}{70} + \color{red}{1} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
11. \(\begin{align} & 83 + 10\\= &10+83\\= &10 + \color{green}{80} + \color{red}{3} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
12. \(\begin{align} & 63 + 34\\= & \color{green}{60} + \color{red}{3} + \color{green}{30} + \color{red}{4} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)