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1. \(8 + 74 = \ldots\)
2. \(8 + 63 = \ldots\)
3. \(7 + 34 = \ldots\)
4. \(32 + 9 = \ldots\)
5. \(59 + 4 = \ldots\)
6. \(47 + 4 = \ldots\)
7. \(77 + 6 = \ldots\)
8. \(55 + 9 = \ldots\)
9. \(9 + 17 = \ldots\)
10. \(66 + 9 = \ldots\)
11. \(46 + 7 = \ldots\)
12. \(33 + 8 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 8 + 74 \\= & 74 + 8 \\= & 74 + \color{green}{6} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
2. \(\begin{align} & 8 + 63 \\= & 63 + 8 \\= & 63 + \color{green}{7} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
3. \(\begin{align} & 7 + 34 \\= & 34 + 7 \\= & 34 + \color{green}{6} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
4. \(\begin{align} & 32 + 9 \\= & 32 + \color{green}{8} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
5. \(\begin{align} & 59 + 4 \\= & 59 + \color{green}{1} + \color{red}{3} \\= & \color{green}{60} + \color{red}{3} \\= & \color{red}{63} \end{align}\)
6. \(\begin{align} & 47 + 4 \\= & 47 + \color{green}{3} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
7. \(\begin{align} & 77 + 6 \\= & 77 + \color{green}{3} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
8. \(\begin{align} & 55 + 9 \\= & 55 + \color{green}{5} + \color{red}{4} \\= & \color{green}{60} + \color{red}{4} \\= & \color{red}{64} \end{align}\)
9. \(\begin{align} & 9 + 17 \\= & 17 + 9 \\= & 17 + \color{green}{3} + \color{red}{6} \\= & \color{green}{20} + \color{red}{6} \\= & \color{red}{26} \end{align}\)
10. \(\begin{align} & 66 + 9 \\= & 66 + \color{green}{4} + \color{red}{5} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
11. \(\begin{align} & 46 + 7 \\= & 46 + \color{green}{4} + \color{red}{3} \\= & \color{green}{50} + \color{red}{3} \\= & \color{red}{53} \end{align}\)
12. \(\begin{align} & 33 + 8 \\= & 33 + \color{green}{7} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)