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1. \(6 + 78 = \ldots\)
2. \(56 + 6 = \ldots\)
3. \(89 + 6 = \ldots\)
4. \(8 + 67 = \ldots\)
5. \(48 + 9 = \ldots\)
6. \(25 + 9 = \ldots\)
7. \(9 + 45 = \ldots\)
8. \(8 + 35 = \ldots\)
9. \(63 + 9 = \ldots\)
10. \(22 + 9 = \ldots\)
11. \(7 + 64 = \ldots\)
12. \(8 + 49 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 6 + 78 \\= & 78 + 6 \\= & 78 + \color{green}{2} + \color{red}{4} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
2. \(\begin{align} & 56 + 6 \\= & 56 + \color{green}{4} + \color{red}{2} \\= & \color{green}{60} + \color{red}{2} \\= & \color{red}{62} \end{align}\)
3. \(\begin{align} & 89 + 6 \\= & 89 + \color{green}{1} + \color{red}{5} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
4. \(\begin{align} & 8 + 67 \\= & 67 + 8 \\= & 67 + \color{green}{3} + \color{red}{5} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
5. \(\begin{align} & 48 + 9 \\= & 48 + \color{green}{2} + \color{red}{7} \\= & \color{green}{50} + \color{red}{7} \\= & \color{red}{57} \end{align}\)
6. \(\begin{align} & 25 + 9 \\= & 25 + \color{green}{5} + \color{red}{4} \\= & \color{green}{30} + \color{red}{4} \\= & \color{red}{34} \end{align}\)
7. \(\begin{align} & 9 + 45 \\= & 45 + 9 \\= & 45 + \color{green}{5} + \color{red}{4} \\= & \color{green}{50} + \color{red}{4} \\= & \color{red}{54} \end{align}\)
8. \(\begin{align} & 8 + 35 \\= & 35 + 8 \\= & 35 + \color{green}{5} + \color{red}{3} \\= & \color{green}{40} + \color{red}{3} \\= & \color{red}{43} \end{align}\)
9. \(\begin{align} & 63 + 9 \\= & 63 + \color{green}{7} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
10. \(\begin{align} & 22 + 9 \\= & 22 + \color{green}{8} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
11. \(\begin{align} & 7 + 64 \\= & 64 + 7 \\= & 64 + \color{green}{6} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
12. \(\begin{align} & 8 + 49 \\= & 49 + 8 \\= & 49 + \color{green}{1} + \color{red}{7} \\= & \color{green}{50} + \color{red}{7} \\= & \color{red}{57} \end{align}\)