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1. \(60 + 21 = \ldots\)
2. \(30 + 61 = \ldots\)
3. \(65 + 21 = \ldots\)
4. \(14 + 20 = \ldots\)
5. \(61 + 15 = \ldots\)
6. \(17 + 40 = \ldots\)
7. \(62 + 24 = \ldots\)
8. \(57 + 11 = \ldots\)
9. \(82 + 11 = \ldots\)
10. \(38 + 20 = \ldots\)
11. \(16 + 12 = \ldots\)
12. \(36 + 40 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 60 + 21\\= &60 + \color{green}{20} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
2. \(\begin{align} & 30 + 61\\= &30 + \color{green}{60} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
3. \(\begin{align} & 65 + 21\\= & \color{green}{60} + \color{red}{5} + \color{green}{20} + \color{red}{1} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
4. \(\begin{align} & 14 + 20\\= &20+14\\= &20 + \color{green}{10} + \color{red}{4} \\= & \color{green}{30} + \color{red}{4} \\= & \color{red}{34} \end{align}\)
5. \(\begin{align} & 61 + 15\\= & \color{green}{60} + \color{red}{1} + \color{green}{10} + \color{red}{5} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)
6. \(\begin{align} & 17 + 40\\= &40+17\\= &40 + \color{green}{10} + \color{red}{7} \\= & \color{green}{50} + \color{red}{7} \\= & \color{red}{57} \end{align}\)
7. \(\begin{align} & 62 + 24\\= & \color{green}{60} + \color{red}{2} + \color{green}{20} + \color{red}{4} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
8. \(\begin{align} & 57 + 11\\= & \color{green}{50} + \color{red}{7} + \color{green}{10} + \color{red}{1} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)
9. \(\begin{align} & 82 + 11\\= & \color{green}{80} + \color{red}{2} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
10. \(\begin{align} & 38 + 20\\= &20+38\\= &20 + \color{green}{30} + \color{red}{8} \\= & \color{green}{50} + \color{red}{8} \\= & \color{red}{58} \end{align}\)
11. \(\begin{align} & 16 + 12\\= & \color{green}{10} + \color{red}{6} + \color{green}{10} + \color{red}{2} \\= & \color{green}{20} + \color{red}{8} \\= & \color{red}{28} \end{align}\)
12. \(\begin{align} & 36 + 40\\= &40+36\\= &40 + \color{green}{30} + \color{red}{6} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)