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1. \(4 + 69 = \ldots\)
2. \(12 + 9 = \ldots\)
3. \(67 + 6 = \ldots\)
4. \(47 + 6 = \ldots\)
5. \(54 + 9 = \ldots\)
6. \(5 + 36 = \ldots\)
7. \(73 + 8 = \ldots\)
8. \(8 + 28 = \ldots\)
9. \(8 + 53 = \ldots\)
10. \(82 + 9 = \ldots\)
11. \(2 + 49 = \ldots\)
12. \(9 + 42 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 4 + 69 \\= & 69 + 4 \\= & 69 + \color{green}{1} + \color{red}{3} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
2. \(\begin{align} & 12 + 9 \\= & 12 + \color{green}{8} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
3. \(\begin{align} & 67 + 6 \\= & 67 + \color{green}{3} + \color{red}{3} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
4. \(\begin{align} & 47 + 6 \\= & 47 + \color{green}{3} + \color{red}{3} \\= & \color{green}{50} + \color{red}{3} \\= & \color{red}{53} \end{align}\)
5. \(\begin{align} & 54 + 9 \\= & 54 + \color{green}{6} + \color{red}{3} \\= & \color{green}{60} + \color{red}{3} \\= & \color{red}{63} \end{align}\)
6. \(\begin{align} & 5 + 36 \\= & 36 + 5 \\= & 36 + \color{green}{4} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
7. \(\begin{align} & 73 + 8 \\= & 73 + \color{green}{7} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
8. \(\begin{align} & 8 + 28 \\= & 28 + 8 \\= & 28 + \color{green}{2} + \color{red}{6} \\= & \color{green}{30} + \color{red}{6} \\= & \color{red}{36} \end{align}\)
9. \(\begin{align} & 8 + 53 \\= & 53 + 8 \\= & 53 + \color{green}{7} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
10. \(\begin{align} & 82 + 9 \\= & 82 + \color{green}{8} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
11. \(\begin{align} & 2 + 49 \\= & 49 + 2 \\= & 49 + \color{green}{1} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
12. \(\begin{align} & 9 + 42 \\= & 42 + 9 \\= & 42 + \color{green}{8} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)