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1. \(8 + 75 = \ldots\)
2. \(8 + 69 = \ldots\)
3. \(75 + 9 = \ldots\)
4. \(36 + 8 = \ldots\)
5. \(85 + 8 = \ldots\)
6. \(9 + 89 = \ldots\)
7. \(52 + 9 = \ldots\)
8. \(9 + 87 = \ldots\)
9. \(69 + 9 = \ldots\)
10. \(9 + 32 = \ldots\)
11. \(37 + 4 = \ldots\)
12. \(25 + 7 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 8 + 75 \\= & 75 + 8 \\= & 75 + \color{green}{5} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
2. \(\begin{align} & 8 + 69 \\= & 69 + 8 \\= & 69 + \color{green}{1} + \color{red}{7} \\= & \color{green}{70} + \color{red}{7} \\= & \color{red}{77} \end{align}\)
3. \(\begin{align} & 75 + 9 \\= & 75 + \color{green}{5} + \color{red}{4} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
4. \(\begin{align} & 36 + 8 \\= & 36 + \color{green}{4} + \color{red}{4} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
5. \(\begin{align} & 85 + 8 \\= & 85 + \color{green}{5} + \color{red}{3} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
6. \(\begin{align} & 9 + 89 \\= & 89 + 9 \\= & 89 + \color{green}{1} + \color{red}{8} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
7. \(\begin{align} & 52 + 9 \\= & 52 + \color{green}{8} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
8. \(\begin{align} & 9 + 87 \\= & 87 + 9 \\= & 87 + \color{green}{3} + \color{red}{6} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
9. \(\begin{align} & 69 + 9 \\= & 69 + \color{green}{1} + \color{red}{8} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
10. \(\begin{align} & 9 + 32 \\= & 32 + 9 \\= & 32 + \color{green}{8} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
11. \(\begin{align} & 37 + 4 \\= & 37 + \color{green}{3} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
12. \(\begin{align} & 25 + 7 \\= & 25 + \color{green}{5} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}\)