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1. \(72 + 9 = \ldots\)
2. \(4 + 58 = \ldots\)
3. \(88 + 6 = \ldots\)
4. \(7 + 34 = \ldots\)
5. \(37 + 6 = \ldots\)
6. \(77 + 9 = \ldots\)
7. \(18 + 8 = \ldots\)
8. \(79 + 3 = \ldots\)
9. \(8 + 84 = \ldots\)
10. \(67 + 8 = \ldots\)
11. \(62 + 9 = \ldots\)
12. \(7 + 17 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 72 + 9 \\= & 72 + \color{green}{8} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
2. \(\begin{align} & 4 + 58 \\= & 58 + 4 \\= & 58 + \color{green}{2} + \color{red}{2} \\= & \color{green}{60} + \color{red}{2} \\= & \color{red}{62} \end{align}\)
3. \(\begin{align} & 88 + 6 \\= & 88 + \color{green}{2} + \color{red}{4} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
4. \(\begin{align} & 7 + 34 \\= & 34 + 7 \\= & 34 + \color{green}{6} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
5. \(\begin{align} & 37 + 6 \\= & 37 + \color{green}{3} + \color{red}{3} \\= & \color{green}{40} + \color{red}{3} \\= & \color{red}{43} \end{align}\)
6. \(\begin{align} & 77 + 9 \\= & 77 + \color{green}{3} + \color{red}{6} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
7. \(\begin{align} & 18 + 8 \\= & 18 + \color{green}{2} + \color{red}{6} \\= & \color{green}{20} + \color{red}{6} \\= & \color{red}{26} \end{align}\)
8. \(\begin{align} & 79 + 3 \\= & 79 + \color{green}{1} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
9. \(\begin{align} & 8 + 84 \\= & 84 + 8 \\= & 84 + \color{green}{6} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
10. \(\begin{align} & 67 + 8 \\= & 67 + \color{green}{3} + \color{red}{5} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
11. \(\begin{align} & 62 + 9 \\= & 62 + \color{green}{8} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
12. \(\begin{align} & 7 + 17 \\= & 17 + 7 \\= & 17 + \color{green}{3} + \color{red}{4} \\= & \color{green}{20} + \color{red}{4} \\= & \color{red}{24} \end{align}\)