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1. \(75 + 7 = \ldots\)
2. \(42 + 9 = \ldots\)
3. \(64 + 8 = \ldots\)
4. \(38 + 8 = \ldots\)
5. \(69 + 7 = \ldots\)
6. \(84 + 9 = \ldots\)
7. \(14 + 9 = \ldots\)
8. \(5 + 89 = \ldots\)
9. \(7 + 15 = \ldots\)
10. \(9 + 16 = \ldots\)
11. \(59 + 9 = \ldots\)
12. \(9 + 62 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 75 + 7 \\= & 75 + \color{green}{5} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
2. \(\begin{align} & 42 + 9 \\= & 42 + \color{green}{8} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
3. \(\begin{align} & 64 + 8 \\= & 64 + \color{green}{6} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
4. \(\begin{align} & 38 + 8 \\= & 38 + \color{green}{2} + \color{red}{6} \\= & \color{green}{40} + \color{red}{6} \\= & \color{red}{46} \end{align}\)
5. \(\begin{align} & 69 + 7 \\= & 69 + \color{green}{1} + \color{red}{6} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)
6. \(\begin{align} & 84 + 9 \\= & 84 + \color{green}{6} + \color{red}{3} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
7. \(\begin{align} & 14 + 9 \\= & 14 + \color{green}{6} + \color{red}{3} \\= & \color{green}{20} + \color{red}{3} \\= & \color{red}{23} \end{align}\)
8. \(\begin{align} & 5 + 89 \\= & 89 + 5 \\= & 89 + \color{green}{1} + \color{red}{4} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
9. \(\begin{align} & 7 + 15 \\= & 15 + 7 \\= & 15 + \color{green}{5} + \color{red}{2} \\= & \color{green}{20} + \color{red}{2} \\= & \color{red}{22} \end{align}\)
10. \(\begin{align} & 9 + 16 \\= & 16 + 9 \\= & 16 + \color{green}{4} + \color{red}{5} \\= & \color{green}{20} + \color{red}{5} \\= & \color{red}{25} \end{align}\)
11. \(\begin{align} & 59 + 9 \\= & 59 + \color{green}{1} + \color{red}{8} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)
12. \(\begin{align} & 9 + 62 \\= & 62 + 9 \\= & 62 + \color{green}{8} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)