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1. \(9 + 52 = \ldots\)
2. \(3 + 79 = \ldots\)
3. \(13 + 8 = \ldots\)
4. \(29 + 8 = \ldots\)
5. \(8 + 36 = \ldots\)
6. \(33 + 8 = \ldots\)
7. \(7 + 89 = \ldots\)
8. \(86 + 9 = \ldots\)
9. \(2 + 69 = \ldots\)
10. \(7 + 17 = \ldots\)
11. \(49 + 9 = \ldots\)
12. \(8 + 78 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 9 + 52 \\= & 52 + 9 \\= & 52 + \color{green}{8} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
2. \(\begin{align} & 3 + 79 \\= & 79 + 3 \\= & 79 + \color{green}{1} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
3. \(\begin{align} & 13 + 8 \\= & 13 + \color{green}{7} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
4. \(\begin{align} & 29 + 8 \\= & 29 + \color{green}{1} + \color{red}{7} \\= & \color{green}{30} + \color{red}{7} \\= & \color{red}{37} \end{align}\)
5. \(\begin{align} & 8 + 36 \\= & 36 + 8 \\= & 36 + \color{green}{4} + \color{red}{4} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
6. \(\begin{align} & 33 + 8 \\= & 33 + \color{green}{7} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
7. \(\begin{align} & 7 + 89 \\= & 89 + 7 \\= & 89 + \color{green}{1} + \color{red}{6} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
8. \(\begin{align} & 86 + 9 \\= & 86 + \color{green}{4} + \color{red}{5} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
9. \(\begin{align} & 2 + 69 \\= & 69 + 2 \\= & 69 + \color{green}{1} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
10. \(\begin{align} & 7 + 17 \\= & 17 + 7 \\= & 17 + \color{green}{3} + \color{red}{4} \\= & \color{green}{20} + \color{red}{4} \\= & \color{red}{24} \end{align}\)
11. \(\begin{align} & 49 + 9 \\= & 49 + \color{green}{1} + \color{red}{8} \\= & \color{green}{50} + \color{red}{8} \\= & \color{red}{58} \end{align}\)
12. \(\begin{align} & 8 + 78 \\= & 78 + 8 \\= & 78 + \color{green}{2} + \color{red}{6} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)