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1. \(65 + 7 = \ldots\)
2. \(68 + 7 = \ldots\)
3. \(9 + 24 = \ldots\)
4. \(15 + 9 = \ldots\)
5. \(9 + 17 = \ldots\)
6. \(44 + 7 = \ldots\)
7. \(75 + 8 = \ldots\)
8. \(36 + 9 = \ldots\)
9. \(57 + 7 = \ldots\)
10. \(86 + 8 = \ldots\)
11. \(4 + 47 = \ldots\)
12. \(37 + 9 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 65 + 7 \\= & 65 + \color{green}{5} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
2. \(\begin{align} & 68 + 7 \\= & 68 + \color{green}{2} + \color{red}{5} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
3. \(\begin{align} & 9 + 24 \\= & 24 + 9 \\= & 24 + \color{green}{6} + \color{red}{3} \\= & \color{green}{30} + \color{red}{3} \\= & \color{red}{33} \end{align}\)
4. \(\begin{align} & 15 + 9 \\= & 15 + \color{green}{5} + \color{red}{4} \\= & \color{green}{20} + \color{red}{4} \\= & \color{red}{24} \end{align}\)
5. \(\begin{align} & 9 + 17 \\= & 17 + 9 \\= & 17 + \color{green}{3} + \color{red}{6} \\= & \color{green}{20} + \color{red}{6} \\= & \color{red}{26} \end{align}\)
6. \(\begin{align} & 44 + 7 \\= & 44 + \color{green}{6} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
7. \(\begin{align} & 75 + 8 \\= & 75 + \color{green}{5} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
8. \(\begin{align} & 36 + 9 \\= & 36 + \color{green}{4} + \color{red}{5} \\= & \color{green}{40} + \color{red}{5} \\= & \color{red}{45} \end{align}\)
9. \(\begin{align} & 57 + 7 \\= & 57 + \color{green}{3} + \color{red}{4} \\= & \color{green}{60} + \color{red}{4} \\= & \color{red}{64} \end{align}\)
10. \(\begin{align} & 86 + 8 \\= & 86 + \color{green}{4} + \color{red}{4} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
11. \(\begin{align} & 4 + 47 \\= & 47 + 4 \\= & 47 + \color{green}{3} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
12. \(\begin{align} & 37 + 9 \\= & 37 + \color{green}{3} + \color{red}{6} \\= & \color{green}{40} + \color{red}{6} \\= & \color{red}{46} \end{align}\)