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1. \(8 + 13 = \ldots\)
2. \(87 + 5 = \ldots\)
3. \(38 + 3 = \ldots\)
4. \(8 + 36 = \ldots\)
5. \(9 + 37 = \ldots\)
6. \(7 + 17 = \ldots\)
7. \(24 + 8 = \ldots\)
8. \(56 + 5 = \ldots\)
9. \(4 + 89 = \ldots\)
10. \(9 + 62 = \ldots\)
11. \(3 + 59 = \ldots\)
12. \(8 + 24 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 8 + 13 \\= & 13 + 8 \\= & 13 + \color{green}{7} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
2. \(\begin{align} & 87 + 5 \\= & 87 + \color{green}{3} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
3. \(\begin{align} & 38 + 3 \\= & 38 + \color{green}{2} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
4. \(\begin{align} & 8 + 36 \\= & 36 + 8 \\= & 36 + \color{green}{4} + \color{red}{4} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
5. \(\begin{align} & 9 + 37 \\= & 37 + 9 \\= & 37 + \color{green}{3} + \color{red}{6} \\= & \color{green}{40} + \color{red}{6} \\= & \color{red}{46} \end{align}\)
6. \(\begin{align} & 7 + 17 \\= & 17 + 7 \\= & 17 + \color{green}{3} + \color{red}{4} \\= & \color{green}{20} + \color{red}{4} \\= & \color{red}{24} \end{align}\)
7. \(\begin{align} & 24 + 8 \\= & 24 + \color{green}{6} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}\)
8. \(\begin{align} & 56 + 5 \\= & 56 + \color{green}{4} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
9. \(\begin{align} & 4 + 89 \\= & 89 + 4 \\= & 89 + \color{green}{1} + \color{red}{3} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
10. \(\begin{align} & 9 + 62 \\= & 62 + 9 \\= & 62 + \color{green}{8} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
11. \(\begin{align} & 3 + 59 \\= & 59 + 3 \\= & 59 + \color{green}{1} + \color{red}{2} \\= & \color{green}{60} + \color{red}{2} \\= & \color{red}{62} \end{align}\)
12. \(\begin{align} & 8 + 24 \\= & 24 + 8 \\= & 24 + \color{green}{6} + \color{red}{2} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}\)