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1. \(7 + 24 = \ldots\)
2. \(18 + 8 = \ldots\)
3. \(74 + 9 = \ldots\)
4. \(59 + 7 = \ldots\)
5. \(5 + 48 = \ldots\)
6. \(65 + 8 = \ldots\)
7. \(78 + 8 = \ldots\)
8. \(77 + 4 = \ldots\)
9. \(9 + 23 = \ldots\)
10. \(23 + 9 = \ldots\)
11. \(52 + 9 = \ldots\)
12. \(17 + 5 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 7 + 24 \\= & 24 + 7 \\= & 24 + \color{green}{6} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
2. \(\begin{align} & 18 + 8 \\= & 18 + \color{green}{2} + \color{red}{6} \\= & \color{green}{20} + \color{red}{6} \\= & \color{red}{26} \end{align}\)
3. \(\begin{align} & 74 + 9 \\= & 74 + \color{green}{6} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
4. \(\begin{align} & 59 + 7 \\= & 59 + \color{green}{1} + \color{red}{6} \\= & \color{green}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)
5. \(\begin{align} & 5 + 48 \\= & 48 + 5 \\= & 48 + \color{green}{2} + \color{red}{3} \\= & \color{green}{50} + \color{red}{3} \\= & \color{red}{53} \end{align}\)
6. \(\begin{align} & 65 + 8 \\= & 65 + \color{green}{5} + \color{red}{3} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
7. \(\begin{align} & 78 + 8 \\= & 78 + \color{green}{2} + \color{red}{6} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
8. \(\begin{align} & 77 + 4 \\= & 77 + \color{green}{3} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
9. \(\begin{align} & 9 + 23 \\= & 23 + 9 \\= & 23 + \color{green}{7} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}\)
10. \(\begin{align} & 23 + 9 \\= & 23 + \color{green}{7} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}\)
11. \(\begin{align} & 52 + 9 \\= & 52 + \color{green}{8} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
12. \(\begin{align} & 17 + 5 \\= & 17 + \color{green}{3} + \color{red}{2} \\= & \color{green}{20} + \color{red}{2} \\= & \color{red}{22} \end{align}\)