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1. \(27 + 51 = \ldots\)
2. \(52 + 46 = \ldots\)
3. \(15 + 10 = \ldots\)
4. \(39 + 60 = \ldots\)
5. \(11 + 62 = \ldots\)
6. \(33 + 64 = \ldots\)
7. \(33 + 63 = \ldots\)
8. \(36 + 20 = \ldots\)
9. \(78 + 10 = \ldots\)
10. \(67 + 11 = \ldots\)
11. \(63 + 11 = \ldots\)
12. \(37 + 62 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 27 + 51\\= & \color{green}{20} + \color{red}{7} + \color{green}{50} + \color{red}{1} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
2. \(\begin{align} & 52 + 46\\= & \color{green}{50} + \color{red}{2} + \color{green}{40} + \color{red}{6} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
3. \(\begin{align} & 15 + 10\\= &10+15\\= &10 + \color{green}{10} + \color{red}{5} \\= & \color{green}{20} + \color{red}{5} \\= & \color{red}{25} \end{align}\)
4. \(\begin{align} & 39 + 60\\= &60+39\\= &60 + \color{green}{30} + \color{red}{9} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
5. \(\begin{align} & 11 + 62\\= & \color{green}{10} + \color{red}{1} + \color{green}{60} + \color{red}{2} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
6. \(\begin{align} & 33 + 64\\= & \color{green}{30} + \color{red}{3} + \color{green}{60} + \color{red}{4} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
7. \(\begin{align} & 33 + 63\\= & \color{green}{30} + \color{red}{3} + \color{green}{60} + \color{red}{3} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
8. \(\begin{align} & 36 + 20\\= &20+36\\= &20 + \color{green}{30} + \color{red}{6} \\= & \color{green}{50} + \color{red}{6} \\= & \color{red}{56} \end{align}\)
9. \(\begin{align} & 78 + 10\\= &10+78\\= &10 + \color{green}{70} + \color{red}{8} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
10. \(\begin{align} & 67 + 11\\= & \color{green}{60} + \color{red}{7} + \color{green}{10} + \color{red}{1} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
11. \(\begin{align} & 63 + 11\\= & \color{green}{60} + \color{red}{3} + \color{green}{10} + \color{red}{1} \\= & \color{green}{70} + \color{red}{4} \\= & \color{red}{74} \end{align}\)
12. \(\begin{align} & 37 + 62\\= & \color{green}{30} + \color{red}{7} + \color{green}{60} + \color{red}{2} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)