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1. \(8 + 53 = \ldots\)
2. \(9 + 22 = \ldots\)
3. \(6 + 67 = \ldots\)
4. \(8 + 63 = \ldots\)
5. \(67 + 6 = \ldots\)
6. \(75 + 7 = \ldots\)
7. \(68 + 7 = \ldots\)
8. \(7 + 14 = \ldots\)
9. \(24 + 7 = \ldots\)
10. \(9 + 42 = \ldots\)
11. \(36 + 9 = \ldots\)
12. \(5 + 38 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 8 + 53 \\= & 53 + 8 \\= & 53 + \color{green}{7} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
2. \(\begin{align} & 9 + 22 \\= & 22 + 9 \\= & 22 + \color{green}{8} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
3. \(\begin{align} & 6 + 67 \\= & 67 + 6 \\= & 67 + \color{green}{3} + \color{red}{3} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
4. \(\begin{align} & 8 + 63 \\= & 63 + 8 \\= & 63 + \color{green}{7} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
5. \(\begin{align} & 67 + 6 \\= & 67 + \color{green}{3} + \color{red}{3} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
6. \(\begin{align} & 75 + 7 \\= & 75 + \color{green}{5} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
7. \(\begin{align} & 68 + 7 \\= & 68 + \color{green}{2} + \color{red}{5} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
8. \(\begin{align} & 7 + 14 \\= & 14 + 7 \\= & 14 + \color{green}{6} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
9. \(\begin{align} & 24 + 7 \\= & 24 + \color{green}{6} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
10. \(\begin{align} & 9 + 42 \\= & 42 + 9 \\= & 42 + \color{green}{8} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
11. \(\begin{align} & 36 + 9 \\= & 36 + \color{green}{4} + \color{red}{5} \\= & \color{green}{40} + \color{red}{5} \\= & \color{red}{45} \end{align}\)
12. \(\begin{align} & 5 + 38 \\= & 38 + 5 \\= & 38 + \color{green}{2} + \color{red}{3} \\= & \color{green}{40} + \color{red}{3} \\= & \color{red}{43} \end{align}\)