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1. \(52 + 34 = \ldots\)
2. \(19 + 60 = \ldots\)
3. \(72 + 12 = \ldots\)
4. \(74 + 21 = \ldots\)
5. \(54 + 42 = \ldots\)
6. \(49 + 20 = \ldots\)
7. \(55 + 13 = \ldots\)
8. \(26 + 53 = \ldots\)
9. \(18 + 30 = \ldots\)
10. \(21 + 64 = \ldots\)
11. \(83 + 10 = \ldots\)
12. \(45 + 24 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 52 + 34\\= & \color{green}{50} + \color{red}{2} + \color{green}{30} + \color{red}{4} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
2. \(\begin{align} & 19 + 60\\= &60+19\\= &60 + \color{green}{10} + \color{red}{9} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
3. \(\begin{align} & 72 + 12\\= & \color{green}{70} + \color{red}{2} + \color{green}{10} + \color{red}{2} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
4. \(\begin{align} & 74 + 21\\= & \color{green}{70} + \color{red}{4} + \color{green}{20} + \color{red}{1} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
5. \(\begin{align} & 54 + 42\\= & \color{green}{50} + \color{red}{4} + \color{green}{40} + \color{red}{2} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
6. \(\begin{align} & 49 + 20\\= &20+49\\= &20 + \color{green}{40} + \color{red}{9} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
7. \(\begin{align} & 55 + 13\\= & \color{green}{50} + \color{red}{5} + \color{green}{10} + \color{red}{3} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)
8. \(\begin{align} & 26 + 53\\= & \color{green}{20} + \color{red}{6} + \color{green}{50} + \color{red}{3} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
9. \(\begin{align} & 18 + 30\\= &30+18\\= &30 + \color{green}{10} + \color{red}{8} \\= & \color{green}{40} + \color{red}{8} \\= & \color{red}{48} \end{align}\)
10. \(\begin{align} & 21 + 64\\= & \color{green}{20} + \color{red}{1} + \color{green}{60} + \color{red}{4} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
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. \(\begin{align} & 45 + 24\\= & \color{green}{40} + \color{red}{5} + \color{green}{20} + \color{red}{4} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)