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1. \(71 + 13 = \ldots\)
2. \(78 + 20 = \ldots\)
3. \(23 + 13 = \ldots\)
4. \(21 + 26 = \ldots\)
5. \(76 + 13 = \ldots\)
6. \(14 + 61 = \ldots\)
7. \(16 + 81 = \ldots\)
8. \(37 + 50 = \ldots\)
9. \(21 + 21 = \ldots\)
10. \(87 + 11 = \ldots\)
11. \(71 + 16 = \ldots\)
12. \(57 + 40 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 71 + 13\\= & \color{green}{70} + \color{red}{1} + \color{green}{10} + \color{red}{3} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
2. \(\begin{align} & 78 + 20\\= &20+78\\= &20 + \color{green}{70} + \color{red}{8} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
3. \(\begin{align} & 23 + 13\\= & \color{green}{20} + \color{red}{3} + \color{green}{10} + \color{red}{3} \\= & \color{green}{30} + \color{red}{6} \\= & \color{red}{36} \end{align}\)
4. \(\begin{align} & 21 + 26\\= & \color{green}{20} + \color{red}{1} + \color{green}{20} + \color{red}{6} \\= & \color{green}{40} + \color{red}{7} \\= & \color{red}{47} \end{align}\)
5. \(\begin{align} & 76 + 13\\= & \color{green}{70} + \color{red}{6} + \color{green}{10} + \color{red}{3} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
6. \(\begin{align} & 14 + 61\\= & \color{green}{10} + \color{red}{4} + \color{green}{60} + \color{red}{1} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
7. \(\begin{align} & 16 + 81\\= & \color{green}{10} + \color{red}{6} + \color{green}{80} + \color{red}{1} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
8. \(\begin{align} & 37 + 50\\= &50+37\\= &50 + \color{green}{30} + \color{red}{7} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
9. \(\begin{align} & 21 + 21\\= & \color{green}{20} + \color{red}{1} + \color{green}{20} + \color{red}{1} \\= & \color{green}{40} + \color{red}{2} \\= & \color{red}{42} \end{align}\)
10. \(\begin{align} & 87 + 11\\= & \color{green}{80} + \color{red}{7} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
11. \(\begin{align} & 71 + 16\\= & \color{green}{70} + \color{red}{1} + \color{green}{10} + \color{red}{6} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
12. \(\begin{align} & 57 + 40\\= &40+57\\= &40 + \color{green}{50} + \color{red}{7} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)