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1. \(16 + 70 = \ldots\)
2. \(86 + 12 = \ldots\)
3. \(46 + 40 = \ldots\)
4. \(12 + 27 = \ldots\)
5. \(28 + 11 = \ldots\)
6. \(72 + 26 = \ldots\)
7. \(36 + 30 = \ldots\)
8. \(20 + 46 = \ldots\)
9. \(42 + 10 = \ldots\)
10. \(73 + 20 = \ldots\)
11. \(88 + 11 = \ldots\)
12. \(21 + 25 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 16 + 70\\= &70+16\\= &70 + \color{green}{10} + \color{red}{6} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
2. \(\begin{align} & 86 + 12\\= & \color{green}{80} + \color{red}{6} + \color{green}{10} + \color{red}{2} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
3. \(\begin{align} & 46 + 40\\= &40+46\\= &40 + \color{green}{40} + \color{red}{6} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
4. \(\begin{align} & 12 + 27\\= & \color{green}{10} + \color{red}{2} + \color{green}{20} + \color{red}{7} \\= & \color{green}{30} + \color{red}{9} \\= & \color{red}{39} \end{align}\)
5. \(\begin{align} & 28 + 11\\= & \color{green}{20} + \color{red}{8} + \color{green}{10} + \color{red}{1} \\= & \color{green}{30} + \color{red}{9} \\= & \color{red}{39} \end{align}\)
6. \(\begin{align} & 72 + 26\\= & \color{green}{70} + \color{red}{2} + \color{green}{20} + \color{red}{6} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
7. \(\begin{align} & 36 + 30\\= &30+36\\= &30 + \color{green}{30} + \color{red}{6} \\= & \color{green}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)
8. \(\begin{align} & 20 + 46\\= &20 + \color{green}{40} + \color{red}{6} \\= & \color{green}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)
9. \(\begin{align} & 42 + 10\\= &10+42\\= &10 + \color{green}{40} + \color{red}{2} \\= & \color{green}{50} + \color{red}{2} \\= & \color{red}{52} \end{align}\)
10. \(\begin{align} & 73 + 20\\= &20+73\\= &20 + \color{green}{70} + \color{red}{3} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
11. \(\begin{align} & 88 + 11\\= & \color{green}{80} + \color{red}{8} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
12. \(\begin{align} & 21 + 25\\= & \color{green}{20} + \color{red}{1} + \color{green}{20} + \color{red}{5} \\= & \color{green}{40} + \color{red}{6} \\= & \color{red}{46} \end{align}\)