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1. \(19 + 60 = \ldots\)
2. \(34 + 65 = \ldots\)
3. \(32 + 61 = \ldots\)
4. \(49 + 20 = \ldots\)
5. \(26 + 63 = \ldots\)
6. \(29 + 10 = \ldots\)
7. \(78 + 10 = \ldots\)
8. \(15 + 72 = \ldots\)
9. \(26 + 71 = \ldots\)
10. \(42 + 11 = \ldots\)
11. \(27 + 32 = \ldots\)
12. \(86 + 13 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 19 + 60\\= &60+19\\= &60 + \color{green}{10} + \color{red}{9} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
2. \(\begin{align} & 34 + 65\\= & \color{green}{30} + \color{red}{4} + \color{green}{60} + \color{red}{5} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
3. \(\begin{align} & 32 + 61\\= & \color{green}{30} + \color{red}{2} + \color{green}{60} + \color{red}{1} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
4. \(\begin{align} & 49 + 20\\= &20+49\\= &20 + \color{green}{40} + \color{red}{9} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
5. \(\begin{align} & 26 + 63\\= & \color{green}{20} + \color{red}{6} + \color{green}{60} + \color{red}{3} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
6. \(\begin{align} & 29 + 10\\= &10+29\\= &10 + \color{green}{20} + \color{red}{9} \\= & \color{green}{30} + \color{red}{9} \\= & \color{red}{39} \end{align}\)
7. \(\begin{align} & 78 + 10\\= &10+78\\= &10 + \color{green}{70} + \color{red}{8} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
8. \(\begin{align} & 15 + 72\\= & \color{green}{10} + \color{red}{5} + \color{green}{70} + \color{red}{2} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
9. \(\begin{align} & 26 + 71\\= & \color{green}{20} + \color{red}{6} + \color{green}{70} + \color{red}{1} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
10. \(\begin{align} & 42 + 11\\= & \color{green}{40} + \color{red}{2} + \color{green}{10} + \color{red}{1} \\= & \color{green}{50} + \color{red}{3} \\= & \color{red}{53} \end{align}\)
11. \(\begin{align} & 27 + 32\\= & \color{green}{20} + \color{red}{7} + \color{green}{30} + \color{red}{2} \\= & \color{green}{50} + \color{red}{9} \\= & \color{red}{59} \end{align}\)
12. \(\begin{align} & 86 + 13\\= & \color{green}{80} + \color{red}{6} + \color{green}{10} + \color{red}{3} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)