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1. \(13 + 36 = \ldots\)
2. \(51 + 35 = \ldots\)
3. \(23 + 21 = \ldots\)
4. \(11 + 52 = \ldots\)
5. \(53 + 36 = \ldots\)
6. \(66 + 21 = \ldots\)
7. \(36 + 32 = \ldots\)
8. \(84 + 14 = \ldots\)
9. \(18 + 10 = \ldots\)
10. \(87 + 12 = \ldots\)
11. \(22 + 66 = \ldots\)
12. \(43 + 51 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 13 + 36\\= & \color{green}{10} + \color{red}{3} + \color{green}{30} + \color{red}{6} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)
2. \(\begin{align} & 51 + 35\\= & \color{green}{50} + \color{red}{1} + \color{green}{30} + \color{red}{5} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
3. \(\begin{align} & 23 + 21\\= & \color{green}{20} + \color{red}{3} + \color{green}{20} + \color{red}{1} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
4. \(\begin{align} & 11 + 52\\= & \color{green}{10} + \color{red}{1} + \color{green}{50} + \color{red}{2} \\= & \color{green}{60} + \color{red}{3} \\= & \color{red}{63} \end{align}\)
5. \(\begin{align} & 53 + 36\\= & \color{green}{50} + \color{red}{3} + \color{green}{30} + \color{red}{6} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
6. \(\begin{align} & 66 + 21\\= & \color{green}{60} + \color{red}{6} + \color{green}{20} + \color{red}{1} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
7. \(\begin{align} & 36 + 32\\= & \color{green}{30} + \color{red}{6} + \color{green}{30} + \color{red}{2} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)
8. \(\begin{align} & 84 + 14\\= & \color{green}{80} + \color{red}{4} + \color{green}{10} + \color{red}{4} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
9. \(\begin{align} & 18 + 10\\= &10+18\\= &10 + \color{green}{10} + \color{red}{8} \\= & \color{green}{20} + \color{red}{8} \\= & \color{red}{28} \end{align}\)
10. \(\begin{align} & 87 + 12\\= & \color{green}{80} + \color{red}{7} + \color{green}{10} + \color{red}{2} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
11. \(\begin{align} & 22 + 66\\= & \color{green}{20} + \color{red}{2} + \color{green}{60} + \color{red}{6} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
12. \(\begin{align} & 43 + 51\\= & \color{green}{40} + \color{red}{3} + \color{green}{50} + \color{red}{1} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)