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1. \(86 + 10 = \ldots\)
2. \(41 + 15 = \ldots\)
3. \(48 + 40 = \ldots\)
4. \(89 + 10 = \ldots\)
5. \(27 + 72 = \ldots\)
6. \(51 + 20 = \ldots\)
7. \(65 + 10 = \ldots\)
8. \(57 + 40 = \ldots\)
9. \(67 + 22 = \ldots\)
10. \(11 + 50 = \ldots\)
11. \(15 + 43 = \ldots\)
12. \(46 + 20 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 86 + 10\\= &10+86\\= &10 + \color{green}{80} + \color{red}{6} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
2. \(\begin{align} & 41 + 15\\= & \color{green}{40} + \color{red}{1} + \color{green}{10} + \color{red}{5} \\= & \color{green}{50} + \color{red}{6} \\= & \color{red}{56} \end{align}\)
3. \(\begin{align} & 48 + 40\\= &40+48\\= &40 + \color{green}{40} + \color{red}{8} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
4. \(\begin{align} & 89 + 10\\= &10+89\\= &10 + \color{green}{80} + \color{red}{9} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
5. \(\begin{align} & 27 + 72\\= & \color{green}{20} + \color{red}{7} + \color{green}{70} + \color{red}{2} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
6. \(\begin{align} & 51 + 20\\= &20+51\\= &20 + \color{green}{50} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
7. \(\begin{align} & 65 + 10\\= &10+65\\= &10 + \color{green}{60} + \color{red}{5} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
8. \(\begin{align} & 57 + 40\\= &40+57\\= &40 + \color{green}{50} + \color{red}{7} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
9. \(\begin{align} & 67 + 22\\= & \color{green}{60} + \color{red}{7} + \color{green}{20} + \color{red}{2} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
10. \(\begin{align} & 11 + 50\\= &50+11\\= &50 + \color{green}{10} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
11. \(\begin{align} & 15 + 43\\= & \color{green}{10} + \color{red}{5} + \color{green}{40} + \color{red}{3} \\= & \color{green}{50} + \color{red}{8} \\= & \color{red}{58} \end{align}\)
12. \(\begin{align} & 46 + 20\\= &20+46\\= &20 + \color{green}{40} + \color{red}{6} \\= & \color{green}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)