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1. \(42 + 9 = \ldots\)
2. \(3 + 49 = \ldots\)
3. \(55 + 7 = \ldots\)
4. \(14 + 9 = \ldots\)
5. \(57 + 9 = \ldots\)
6. \(9 + 83 = \ldots\)
7. \(9 + 13 = \ldots\)
8. \(8 + 33 = \ldots\)
9. \(44 + 8 = \ldots\)
10. \(78 + 8 = \ldots\)
11. \(7 + 89 = \ldots\)
12. \(89 + 2 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 42 + 9 \\= & 42 + \color{green}{8} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
2. \(\begin{align} & 3 + 49 \\= & 49 + 3 \\= & 49 + \color{green}{1} + \color{red}{2} \\= & \color{green}{50} + \color{red}{2} \\= & \color{red}{52} \end{align}\)
3. \(\begin{align} & 55 + 7 \\= & 55 + \color{green}{5} + \color{red}{2} \\= & \color{green}{60} + \color{red}{2} \\= & \color{red}{62} \end{align}\)
4. \(\begin{align} & 14 + 9 \\= & 14 + \color{green}{6} + \color{red}{3} \\= & \color{green}{20} + \color{red}{3} \\= & \color{red}{23} \end{align}\)
5. \(\begin{align} & 57 + 9 \\= & 57 + \color{green}{3} + \color{red}{6} \\= & \color{green}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)
6. \(\begin{align} & 9 + 83 \\= & 83 + 9 \\= & 83 + \color{green}{7} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
7. \(\begin{align} & 9 + 13 \\= & 13 + 9 \\= & 13 + \color{green}{7} + \color{red}{2} \\= & \color{green}{20} + \color{red}{2} \\= & \color{red}{22} \end{align}\)
8. \(\begin{align} & 8 + 33 \\= & 33 + 8 \\= & 33 + \color{green}{7} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
9. \(\begin{align} & 44 + 8 \\= & 44 + \color{green}{6} + \color{red}{2} \\= & \color{green}{50} + \color{red}{2} \\= & \color{red}{52} \end{align}\)
10. \(\begin{align} & 78 + 8 \\= & 78 + \color{green}{2} + \color{red}{6} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
11. \(\begin{align} & 7 + 89 \\= & 89 + 7 \\= & 89 + \color{green}{1} + \color{red}{6} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
12. \(\begin{align} & 89 + 2 \\= & 89 + \color{green}{1} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)