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1. \(9 + 63 = \ldots\)
2. \(46 + 7 = \ldots\)
3. \(9 + 73 = \ldots\)
4. \(7 + 38 = \ldots\)
5. \(9 + 62 = \ldots\)
6. \(22 + 9 = \ldots\)
7. \(4 + 18 = \ldots\)
8. \(9 + 57 = \ldots\)
9. \(36 + 8 = \ldots\)
10. \(32 + 9 = \ldots\)
11. \(57 + 9 = \ldots\)
12. \(56 + 6 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 9 + 63 \\= & 63 + 9 \\= & 63 + \color{green}{7} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
2. \(\begin{align} & 46 + 7 \\= & 46 + \color{green}{4} + \color{red}{3} \\= & \color{green}{50} + \color{red}{3} \\= & \color{red}{53} \end{align}\)
3. \(\begin{align} & 9 + 73 \\= & 73 + 9 \\= & 73 + \color{green}{7} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
4. \(\begin{align} & 7 + 38 \\= & 38 + 7 \\= & 38 + \color{green}{2} + \color{red}{5} \\= & \color{green}{40} + \color{red}{5} \\= & \color{red}{45} \end{align}\)
5. \(\begin{align} & 9 + 62 \\= & 62 + 9 \\= & 62 + \color{green}{8} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
6. \(\begin{align} & 22 + 9 \\= & 22 + \color{green}{8} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
7. \(\begin{align} & 4 + 18 \\= & 18 + 4 \\= & 18 + \color{green}{2} + \color{red}{2} \\= & \color{green}{20} + \color{red}{2} \\= & \color{red}{22} \end{align}\)
8. \(\begin{align} & 9 + 57 \\= & 57 + 9 \\= & 57 + \color{green}{3} + \color{red}{6} \\= & \color{green}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)
9. \(\begin{align} & 36 + 8 \\= & 36 + \color{green}{4} + \color{red}{4} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
10. \(\begin{align} & 32 + 9 \\= & 32 + \color{green}{8} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
11. \(\begin{align} & 57 + 9 \\= & 57 + \color{green}{3} + \color{red}{6} \\= & \color{green}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)
12. \(\begin{align} & 56 + 6 \\= & 56 + \color{green}{4} + \color{red}{2} \\= & \color{green}{60} + \color{red}{2} \\= & \color{red}{62} \end{align}\)