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1. \(11 + 17 = \ldots\)
2. \(23 + 15 = \ldots\)
3. \(23 + 64 = \ldots\)
4. \(53 + 42 = \ldots\)
5. \(25 + 13 = \ldots\)
6. \(52 + 22 = \ldots\)
7. \(41 + 23 = \ldots\)
8. \(16 + 81 = \ldots\)
9. \(51 + 12 = \ldots\)
10. \(26 + 30 = \ldots\)
11. \(59 + 10 = \ldots\)
12. \(89 + 10 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 11 + 17\\= & \color{green}{10} + \color{red}{1} + \color{green}{10} + \color{red}{7} \\= & \color{green}{20} + \color{red}{8} \\= & \color{red}{28} \end{align}\)
2. \(\begin{align} & 23 + 15\\= & \color{green}{20} + \color{red}{3} + \color{green}{10} + \color{red}{5} \\= & \color{green}{30} + \color{red}{8} \\= & \color{red}{38} \end{align}\)
3. \(\begin{align} & 23 + 64\\= & \color{green}{20} + \color{red}{3} + \color{green}{60} + \color{red}{4} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
4. \(\begin{align} & 53 + 42\\= & \color{green}{50} + \color{red}{3} + \color{green}{40} + \color{red}{2} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
5. \(\begin{align} & 25 + 13\\= & \color{green}{20} + \color{red}{5} + \color{green}{10} + \color{red}{3} \\= & \color{green}{30} + \color{red}{8} \\= & \color{red}{38} \end{align}\)
6. \(\begin{align} & 52 + 22\\= & \color{green}{50} + \color{red}{2} + \color{green}{20} + \color{red}{2} \\= & \color{green}{70} + \color{red}{4} \\= & \color{red}{74} \end{align}\)
7. \(\begin{align} & 41 + 23\\= & \color{green}{40} + \color{red}{1} + \color{green}{20} + \color{red}{3} \\= & \color{green}{60} + \color{red}{4} \\= & \color{red}{64} \end{align}\)
8. \(\begin{align} & 16 + 81\\= & \color{green}{10} + \color{red}{6} + \color{green}{80} + \color{red}{1} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
9. \(\begin{align} & 51 + 12\\= & \color{green}{50} + \color{red}{1} + \color{green}{10} + \color{red}{2} \\= & \color{green}{60} + \color{red}{3} \\= & \color{red}{63} \end{align}\)
10. \(\begin{align} & 26 + 30\\= &30+26\\= &30 + \color{green}{20} + \color{red}{6} \\= & \color{green}{50} + \color{red}{6} \\= & \color{red}{56} \end{align}\)
11. \(\begin{align} & 59 + 10\\= &10+59\\= &10 + \color{green}{50} + \color{red}{9} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
12. \(\begin{align} & 89 + 10\\= &10+89\\= &10 + \color{green}{80} + \color{red}{9} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)