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1. \(9 + 22 = \ldots\)
2. \(7 + 29 = \ldots\)
3. \(9 + 83 = \ldots\)
4. \(58 + 6 = \ldots\)
5. \(66 + 5 = \ldots\)
6. \(76 + 7 = \ldots\)
7. \(17 + 4 = \ldots\)
8. \(49 + 2 = \ldots\)
9. \(47 + 4 = \ldots\)
10. \(8 + 45 = \ldots\)
11. \(34 + 7 = \ldots\)
12. \(9 + 63 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 9 + 22 \\= & 22 + 9 \\= & 22 + \color{green}{8} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)
2. \(\begin{align} & 7 + 29 \\= & 29 + 7 \\= & 29 + \color{green}{1} + \color{red}{6} \\= & \color{green}{30} + \color{red}{6} \\= & \color{red}{36} \end{align}\)
3. \(\begin{align} & 9 + 83 \\= & 83 + 9 \\= & 83 + \color{green}{7} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
4. \(\begin{align} & 58 + 6 \\= & 58 + \color{green}{2} + \color{red}{4} \\= & \color{green}{60} + \color{red}{4} \\= & \color{red}{64} \end{align}\)
5. \(\begin{align} & 66 + 5 \\= & 66 + \color{green}{4} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
6. \(\begin{align} & 76 + 7 \\= & 76 + \color{green}{4} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
7. \(\begin{align} & 17 + 4 \\= & 17 + \color{green}{3} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
8. \(\begin{align} & 49 + 2 \\= & 49 + \color{green}{1} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
9. \(\begin{align} & 47 + 4 \\= & 47 + \color{green}{3} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
10. \(\begin{align} & 8 + 45 \\= & 45 + 8 \\= & 45 + \color{green}{5} + \color{red}{3} \\= & \color{green}{50} + \color{red}{3} \\= & \color{red}{53} \end{align}\)
11. \(\begin{align} & 34 + 7 \\= & 34 + \color{green}{6} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
12. \(\begin{align} & 9 + 63 \\= & 63 + 9 \\= & 63 + \color{green}{7} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)