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1. \(56 + 42 = \ldots\)
2. \(30 + 27 = \ldots\)
3. \(78 + 10 = \ldots\)
4. \(64 + 12 = \ldots\)
5. \(82 + 14 = \ldots\)
6. \(36 + 11 = \ldots\)
7. \(18 + 60 = \ldots\)
8. \(80 + 14 = \ldots\)
9. \(85 + 13 = \ldots\)
10. \(80 + 18 = \ldots\)
11. \(27 + 51 = \ldots\)
12. \(23 + 76 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 56 + 42\\= & \color{green}{50} + \color{red}{6} + \color{green}{40} + \color{red}{2} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
2. \(\begin{align} & 30 + 27\\= &30 + \color{green}{20} + \color{red}{7} \\= & \color{green}{50} + \color{red}{7} \\= & \color{red}{57} \end{align}\)
3. \(\begin{align} & 78 + 10\\= &10+78\\= &10 + \color{green}{70} + \color{red}{8} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
4. \(\begin{align} & 64 + 12\\= & \color{green}{60} + \color{red}{4} + \color{green}{10} + \color{red}{2} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)
5. \(\begin{align} & 82 + 14\\= & \color{green}{80} + \color{red}{2} + \color{green}{10} + \color{red}{4} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
6. \(\begin{align} & 36 + 11\\= & \color{green}{30} + \color{red}{6} + \color{green}{10} + \color{red}{1} \\= & \color{green}{40} + \color{red}{7} \\= & \color{red}{47} \end{align}\)
7. \(\begin{align} & 18 + 60\\= &60+18\\= &60 + \color{green}{10} + \color{red}{8} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
8. \(\begin{align} & 80 + 14\\= &80 + \color{green}{10} + \color{red}{4} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
9. \(\begin{align} & 85 + 13\\= & \color{green}{80} + \color{red}{5} + \color{green}{10} + \color{red}{3} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
10. \(\begin{align} & 80 + 18\\= &80 + \color{green}{10} + \color{red}{8} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
11. \(\begin{align} & 27 + 51\\= & \color{green}{20} + \color{red}{7} + \color{green}{50} + \color{red}{1} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
12. \(\begin{align} & 23 + 76\\= & \color{green}{20} + \color{red}{3} + \color{green}{70} + \color{red}{6} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)