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1. \(15 + 80 = \ldots\)
2. \(78 + 20 = \ldots\)
3. \(59 + 30 = \ldots\)
4. \(75 + 12 = \ldots\)
5. \(57 + 41 = \ldots\)
6. \(86 + 11 = \ldots\)
7. \(73 + 24 = \ldots\)
8. \(49 + 30 = \ldots\)
9. \(66 + 33 = \ldots\)
10. \(30 + 43 = \ldots\)
11. \(33 + 34 = \ldots\)
12. \(34 + 55 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 15 + 80\\= &80+15\\= &80 + \color{green}{10} + \color{red}{5} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
2. \(\begin{align} & 78 + 20\\= &20+78\\= &20 + \color{green}{70} + \color{red}{8} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
3. \(\begin{align} & 59 + 30\\= &30+59\\= &30 + \color{green}{50} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
4. \(\begin{align} & 75 + 12\\= & \color{green}{70} + \color{red}{5} + \color{green}{10} + \color{red}{2} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
5. \(\begin{align} & 57 + 41\\= & \color{green}{50} + \color{red}{7} + \color{green}{40} + \color{red}{1} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
6. \(\begin{align} & 86 + 11\\= & \color{green}{80} + \color{red}{6} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
7. \(\begin{align} & 73 + 24\\= & \color{green}{70} + \color{red}{3} + \color{green}{20} + \color{red}{4} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
8. \(\begin{align} & 49 + 30\\= &30+49\\= &30 + \color{green}{40} + \color{red}{9} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
9. \(\begin{align} & 66 + 33\\= & \color{green}{60} + \color{red}{6} + \color{green}{30} + \color{red}{3} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
10. \(\begin{align} & 30 + 43\\= &30 + \color{green}{40} + \color{red}{3} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
11. \(\begin{align} & 33 + 34\\= & \color{green}{30} + \color{red}{3} + \color{green}{30} + \color{red}{4} \\= & \color{green}{60} + \color{red}{7} \\= & \color{red}{67} \end{align}\)
12. \(\begin{align} & 34 + 55\\= & \color{green}{30} + \color{red}{4} + \color{green}{50} + \color{red}{5} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)