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1. \(16 + 72 = \ldots\)
2. \(26 + 12 = \ldots\)
3. \(18 + 70 = \ldots\)
4. \(64 + 32 = \ldots\)
5. \(55 + 11 = \ldots\)
6. \(70 + 28 = \ldots\)
7. \(78 + 21 = \ldots\)
8. \(17 + 31 = \ldots\)
9. \(34 + 22 = \ldots\)
10. \(44 + 40 = \ldots\)
11. \(44 + 55 = \ldots\)
12. \(36 + 53 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 16 + 72\\= & \color{green}{10} + \color{red}{6} + \color{green}{70} + \color{red}{2} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
2. \(\begin{align} & 26 + 12\\= & \color{green}{20} + \color{red}{6} + \color{green}{10} + \color{red}{2} \\= & \color{green}{30} + \color{red}{8} \\= & \color{red}{38} \end{align}\)
3. \(\begin{align} & 18 + 70\\= &70+18\\= &70 + \color{green}{10} + \color{red}{8} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
4. \(\begin{align} & 64 + 32\\= & \color{green}{60} + \color{red}{4} + \color{green}{30} + \color{red}{2} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
5. \(\begin{align} & 55 + 11\\= & \color{green}{50} + \color{red}{5} + \color{green}{10} + \color{red}{1} \\= & \color{green}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)
6. \(\begin{align} & 70 + 28\\= &70 + \color{green}{20} + \color{red}{8} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
7. \(\begin{align} & 78 + 21\\= & \color{green}{70} + \color{red}{8} + \color{green}{20} + \color{red}{1} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
8. \(\begin{align} & 17 + 31\\= & \color{green}{10} + \color{red}{7} + \color{green}{30} + \color{red}{1} \\= & \color{green}{40} + \color{red}{8} \\= & \color{red}{48} \end{align}\)
9. \(\begin{align} & 34 + 22\\= & \color{green}{30} + \color{red}{4} + \color{green}{20} + \color{red}{2} \\= & \color{green}{50} + \color{red}{6} \\= & \color{red}{56} \end{align}\)
10. \(\begin{align} & 44 + 40\\= &40+44\\= &40 + \color{green}{40} + \color{red}{4} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
11. \(\begin{align} & 44 + 55\\= & \color{green}{40} + \color{red}{4} + \color{green}{50} + \color{red}{5} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
12. \(\begin{align} & 36 + 53\\= & \color{green}{30} + \color{red}{6} + \color{green}{50} + \color{red}{3} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)