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1. \(26 + 61 = \ldots\)
2. \(22 + 60 = \ldots\)
3. \(42 + 44 = \ldots\)
4. \(50 + 48 = \ldots\)
5. \(87 + 10 = \ldots\)
6. \(56 + 31 = \ldots\)
7. \(82 + 11 = \ldots\)
8. \(13 + 52 = \ldots\)
9. \(77 + 10 = \ldots\)
10. \(81 + 18 = \ldots\)
11. \(82 + 10 = \ldots\)
12. \(21 + 12 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 26 + 61\\= & \color{green}{20} + \color{red}{6} + \color{green}{60} + \color{red}{1} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
2. \(\begin{align} & 22 + 60\\= &60+22\\= &60 + \color{green}{20} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
3. \(\begin{align} & 42 + 44\\= & \color{green}{40} + \color{red}{2} + \color{green}{40} + \color{red}{4} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
4. \(\begin{align} & 50 + 48\\= &50 + \color{green}{40} + \color{red}{8} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
5. \(\begin{align} & 87 + 10\\= &10+87\\= &10 + \color{green}{80} + \color{red}{7} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
6. \(\begin{align} & 56 + 31\\= & \color{green}{50} + \color{red}{6} + \color{green}{30} + \color{red}{1} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
7. \(\begin{align} & 82 + 11\\= & \color{green}{80} + \color{red}{2} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
8. \(\begin{align} & 13 + 52\\= & \color{green}{10} + \color{red}{3} + \color{green}{50} + \color{red}{2} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
9. \(\begin{align} & 77 + 10\\= &10+77\\= &10 + \color{green}{70} + \color{red}{7} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
10. \(\begin{align} & 81 + 18\\= & \color{green}{80} + \color{red}{1} + \color{green}{10} + \color{red}{8} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
11. \(\begin{align} & 82 + 10\\= &10+82\\= &10 + \color{green}{80} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
12. \(\begin{align} & 21 + 12\\= & \color{green}{20} + \color{red}{1} + \color{green}{10} + \color{red}{2} \\= & \color{green}{30} + \color{red}{3} \\= & \color{red}{33} \end{align}\)