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1. \(7 + 88 = \ldots\)
2. \(23 + 8 = \ldots\)
3. \(79 + 4 = \ldots\)
4. \(58 + 6 = \ldots\)
5. \(67 + 9 = \ldots\)
6. \(8 + 48 = \ldots\)
7. \(34 + 9 = \ldots\)
8. \(12 + 9 = \ldots\)
9. \(7 + 28 = \ldots\)
10. \(3 + 89 = \ldots\)
11. \(53 + 8 = \ldots\)
12. \(4 + 79 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 7 + 88 \\= & 88 + 7 \\= & 88 + \color{green}{2} + \color{red}{5} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
2. \(\begin{align} & 23 + 8 \\= & 23 + \color{green}{7} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
3. \(\begin{align} & 79 + 4 \\= & 79 + \color{green}{1} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
4. \(\begin{align} & 58 + 6 \\= & 58 + \color{green}{2} + \color{red}{4} \\= & \color{green}{60} + \color{red}{4} \\= & \color{red}{64} \end{align}\)
5. \(\begin{align} & 67 + 9 \\= & 67 + \color{green}{3} + \color{red}{6} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)
6. \(\begin{align} & 8 + 48 \\= & 48 + 8 \\= & 48 + \color{green}{2} + \color{red}{6} \\= & \color{green}{50} + \color{red}{6} \\= & \color{red}{56} \end{align}\)
7. \(\begin{align} & 34 + 9 \\= & 34 + \color{green}{6} + \color{red}{3} \\= & \color{green}{40} + \color{red}{3} \\= & \color{red}{43} \end{align}\)
8. \(\begin{align} & 12 + 9 \\= & 12 + \color{green}{8} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
9. \(\begin{align} & 7 + 28 \\= & 28 + 7 \\= & 28 + \color{green}{2} + \color{red}{5} \\= & \color{green}{30} + \color{red}{5} \\= & \color{red}{35} \end{align}\)
10. \(\begin{align} & 3 + 89 \\= & 89 + 3 \\= & 89 + \color{green}{1} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
11. \(\begin{align} & 53 + 8 \\= & 53 + \color{green}{7} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
12. \(\begin{align} & 4 + 79 \\= & 79 + 4 \\= & 79 + \color{green}{1} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)