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1. \(55 + 44 = \ldots\)
2. \(38 + 61 = \ldots\)
3. \(20 + 65 = \ldots\)
4. \(63 + 32 = \ldots\)
5. \(39 + 10 = \ldots\)
6. \(61 + 18 = \ldots\)
7. \(47 + 52 = \ldots\)
8. \(56 + 43 = \ldots\)
9. \(31 + 30 = \ldots\)
10. \(78 + 10 = \ldots\)
11. \(43 + 10 = \ldots\)
12. \(10 + 79 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 55 + 44\\= & \color{green}{50} + \color{red}{5} + \color{green}{40} + \color{red}{4} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
2. \(\begin{align} & 38 + 61\\= & \color{green}{30} + \color{red}{8} + \color{green}{60} + \color{red}{1} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
3. \(\begin{align} & 20 + 65\\= &20 + \color{green}{60} + \color{red}{5} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
4. \(\begin{align} & 63 + 32\\= & \color{green}{60} + \color{red}{3} + \color{green}{30} + \color{red}{2} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
5. \(\begin{align} & 39 + 10\\= &10+39\\= &10 + \color{green}{30} + \color{red}{9} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)
6. \(\begin{align} & 61 + 18\\= & \color{green}{60} + \color{red}{1} + \color{green}{10} + \color{red}{8} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
7. \(\begin{align} & 47 + 52\\= & \color{green}{40} + \color{red}{7} + \color{green}{50} + \color{red}{2} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
8. \(\begin{align} & 56 + 43\\= & \color{green}{50} + \color{red}{6} + \color{green}{40} + \color{red}{3} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
9. \(\begin{align} & 31 + 30\\= &30+31\\= &30 + \color{green}{30} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
10. \(\begin{align} & 78 + 10\\= &10+78\\= &10 + \color{green}{70} + \color{red}{8} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
11. \(\begin{align} & 43 + 10\\= &10+43\\= &10 + \color{green}{40} + \color{red}{3} \\= & \color{green}{50} + \color{red}{3} \\= & \color{red}{53} \end{align}\)
12. \(\begin{align} & 10 + 79\\= &10 + \color{green}{70} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)