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1. \(84 + 12 = \ldots\)
2. \(54 + 43 = \ldots\)
3. \(58 + 20 = \ldots\)
4. \(68 + 21 = \ldots\)
5. \(54 + 11 = \ldots\)
6. \(86 + 11 = \ldots\)
7. \(49 + 50 = \ldots\)
8. \(10 + 85 = \ldots\)
9. \(11 + 14 = \ldots\)
10. \(55 + 41 = \ldots\)
11. \(49 + 10 = \ldots\)
12. \(45 + 13 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 84 + 12\\= & \color{green}{80} + \color{red}{4} + \color{green}{10} + \color{red}{2} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
2. \(\begin{align} & 54 + 43\\= & \color{green}{50} + \color{red}{4} + \color{green}{40} + \color{red}{3} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
3. \(\begin{align} & 58 + 20\\= &20+58\\= &20 + \color{green}{50} + \color{red}{8} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
4. \(\begin{align} & 68 + 21\\= & \color{green}{60} + \color{red}{8} + \color{green}{20} + \color{red}{1} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
5. \(\begin{align} & 54 + 11\\= & \color{green}{50} + \color{red}{4} + \color{green}{10} + \color{red}{1} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
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. \(\begin{align} & 49 + 50\\= &50+49\\= &50 + \color{green}{40} + \color{red}{9} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
8. \(\begin{align} & 10 + 85\\= &10 + \color{green}{80} + \color{red}{5} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
9. \(\begin{align} & 11 + 14\\= & \color{green}{10} + \color{red}{1} + \color{green}{10} + \color{red}{4} \\= & \color{green}{20} + \color{red}{5} \\= & \color{red}{25} \end{align}\)
10. \(\begin{align} & 55 + 41\\= & \color{green}{50} + \color{red}{5} + \color{green}{40} + \color{red}{1} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
11. \(\begin{align} & 49 + 10\\= &10+49\\= &10 + \color{green}{40} + \color{red}{9} \\= & \color{green}{50} + \color{red}{9} \\= & \color{red}{59} \end{align}\)
12. \(\begin{align} & 45 + 13\\= & \color{green}{40} + \color{red}{5} + \color{green}{10} + \color{red}{3} \\= & \color{green}{50} + \color{red}{8} \\= & \color{red}{58} \end{align}\)