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1. \(4 + 57 = \ldots\)
2. \(6 + 76 = \ldots\)
3. \(16 + 5 = \ldots\)
4. \(89 + 9 = \ldots\)
5. \(63 + 9 = \ldots\)
6. \(34 + 7 = \ldots\)
7. \(6 + 29 = \ldots\)
8. \(36 + 6 = \ldots\)
9. \(82 + 9 = \ldots\)
10. \(52 + 9 = \ldots\)
11. \(42 + 9 = \ldots\)
12. \(45 + 6 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 4 + 57 \\= & 57 + 4 \\= & 57 + \color{green}{3} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
2. \(\begin{align} & 6 + 76 \\= & 76 + 6 \\= & 76 + \color{green}{4} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
3. \(\begin{align} & 16 + 5 \\= & 16 + \color{green}{4} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
4. \(\begin{align} & 89 + 9 \\= & 89 + \color{green}{1} + \color{red}{8} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
5. \(\begin{align} & 63 + 9 \\= & 63 + \color{green}{7} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
6. \(\begin{align} & 34 + 7 \\= & 34 + \color{green}{6} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
7. \(\begin{align} & 6 + 29 \\= & 29 + 6 \\= & 29 + \color{green}{1} + \color{red}{5} \\= & \color{green}{30} + \color{red}{5} \\= & \color{red}{35} \end{align}\)
8. \(\begin{align} & 36 + 6 \\= & 36 + \color{green}{4} + \color{red}{2} \\= & \color{green}{40} + \color{red}{2} \\= & \color{red}{42} \end{align}\)
9. \(\begin{align} & 82 + 9 \\= & 82 + \color{green}{8} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
10. \(\begin{align} & 52 + 9 \\= & 52 + \color{green}{8} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
11. \(\begin{align} & 42 + 9 \\= & 42 + \color{green}{8} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
12. \(\begin{align} & 45 + 6 \\= & 45 + \color{green}{5} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)