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1. \(14 + 9 = \ldots\)
2. \(9 + 64 = \ldots\)
3. \(34 + 9 = \ldots\)
4. \(7 + 54 = \ldots\)
5. \(25 + 8 = \ldots\)
6. \(16 + 7 = \ldots\)
7. \(2 + 39 = \ldots\)
8. \(68 + 6 = \ldots\)
9. \(18 + 3 = \ldots\)
10. \(83 + 8 = \ldots\)
11. \(29 + 9 = \ldots\)
12. \(9 + 68 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 14 + 9 \\= & 14 + \color{green}{6} + \color{red}{3} \\= & \color{green}{20} + \color{red}{3} \\= & \color{red}{23} \end{align}\)
2. \(\begin{align} & 9 + 64 \\= & 64 + 9 \\= & 64 + \color{green}{6} + \color{red}{3} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
3. \(\begin{align} & 34 + 9 \\= & 34 + \color{green}{6} + \color{red}{3} \\= & \color{green}{40} + \color{red}{3} \\= & \color{red}{43} \end{align}\)
4. \(\begin{align} & 7 + 54 \\= & 54 + 7 \\= & 54 + \color{green}{6} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
5. \(\begin{align} & 25 + 8 \\= & 25 + \color{green}{5} + \color{red}{3} \\= & \color{green}{30} + \color{red}{3} \\= & \color{red}{33} \end{align}\)
6. \(\begin{align} & 16 + 7 \\= & 16 + \color{green}{4} + \color{red}{3} \\= & \color{green}{20} + \color{red}{3} \\= & \color{red}{23} \end{align}\)
7. \(\begin{align} & 2 + 39 \\= & 39 + 2 \\= & 39 + \color{green}{1} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
8. \(\begin{align} & 68 + 6 \\= & 68 + \color{green}{2} + \color{red}{4} \\= & \color{green}{70} + \color{red}{4} \\= & \color{red}{74} \end{align}\)
9. \(\begin{align} & 18 + 3 \\= & 18 + \color{green}{2} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
10. \(\begin{align} & 83 + 8 \\= & 83 + \color{green}{7} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
11. \(\begin{align} & 29 + 9 \\= & 29 + \color{green}{1} + \color{red}{8} \\= & \color{green}{30} + \color{red}{8} \\= & \color{red}{38} \end{align}\)
12. \(\begin{align} & 9 + 68 \\= & 68 + 9 \\= & 68 + \color{green}{2} + \color{red}{7} \\= & \color{green}{70} + \color{red}{7} \\= & \color{red}{77} \end{align}\)