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1. \(9 + 33 = \ldots\)
2. \(9 + 82 = \ldots\)
3. \(68 + 6 = \ldots\)
4. \(4 + 79 = \ldots\)
5. \(39 + 2 = \ldots\)
6. \(77 + 7 = \ldots\)
7. \(7 + 25 = \ldots\)
8. \(15 + 8 = \ldots\)
9. \(78 + 4 = \ldots\)
10. \(27 + 7 = \ldots\)
11. \(55 + 7 = \ldots\)
12. \(7 + 24 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 9 + 33 \\= & 33 + 9 \\= & 33 + \color{green}{7} + \color{red}{2} \\= & \color{green}{40} + \color{red}{2} \\= & \color{red}{42} \end{align}\)
2. \(\begin{align} & 9 + 82 \\= & 82 + 9 \\= & 82 + \color{green}{8} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
3. \(\begin{align} & 68 + 6 \\= & 68 + \color{green}{2} + \color{red}{4} \\= & \color{green}{70} + \color{red}{4} \\= & \color{red}{74} \end{align}\)
4. \(\begin{align} & 4 + 79 \\= & 79 + 4 \\= & 79 + \color{green}{1} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
5. \(\begin{align} & 39 + 2 \\= & 39 + \color{green}{1} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
6. \(\begin{align} & 77 + 7 \\= & 77 + \color{green}{3} + \color{red}{4} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
7. \(\begin{align} & 7 + 25 \\= & 25 + 7 \\= & 25 + \color{green}{5} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}\)
8. \(\begin{align} & 15 + 8 \\= & 15 + \color{green}{5} + \color{red}{3} \\= & \color{green}{20} + \color{red}{3} \\= & \color{red}{23} \end{align}\)
9. \(\begin{align} & 78 + 4 \\= & 78 + \color{green}{2} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
10. \(\begin{align} & 27 + 7 \\= & 27 + \color{green}{3} + \color{red}{4} \\= & \color{green}{30} + \color{red}{4} \\= & \color{red}{34} \end{align}\)
11. \(\begin{align} & 55 + 7 \\= & 55 + \color{green}{5} + \color{red}{2} \\= & \color{green}{60} + \color{red}{2} \\= & \color{red}{62} \end{align}\)
12. \(\begin{align} & 7 + 24 \\= & 24 + 7 \\= & 24 + \color{green}{6} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)