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1. \(70 + 19 = \ldots\)
2. \(55 + 30 = \ldots\)
3. \(10 + 34 = \ldots\)
4. \(10 + 30 = \ldots\)
5. \(16 + 61 = \ldots\)
6. \(44 + 20 = \ldots\)
7. \(84 + 14 = \ldots\)
8. \(12 + 47 = \ldots\)
9. \(67 + 31 = \ldots\)
10. \(66 + 33 = \ldots\)
11. \(13 + 23 = \ldots\)
12. \(88 + 11 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 70 + 19\\= &70 + \color{green}{10} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
2. \(\begin{align} & 55 + 30\\= &30+55\\= &30 + \color{green}{50} + \color{red}{5} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
3. \(\begin{align} & 10 + 34\\= &10 + \color{green}{30} + \color{red}{4} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
4. \(\begin{align} & 10 + 30\\= &10 + \color{green}{30} + \color{red}{0} \\= & \color{green}{40} + \color{red}{0} \\= & \color{red}{40} \end{align}\)
5. \(\begin{align} & 16 + 61\\= & \color{green}{10} + \color{red}{6} + \color{green}{60} + \color{red}{1} \\= & \color{green}{70} + \color{red}{7} \\= & \color{red}{77} \end{align}\)
6. \(\begin{align} & 44 + 20\\= &20+44\\= &20 + \color{green}{40} + \color{red}{4} \\= & \color{green}{60} + \color{red}{4} \\= & \color{red}{64} \end{align}\)
7. \(\begin{align} & 84 + 14\\= & \color{green}{80} + \color{red}{4} + \color{green}{10} + \color{red}{4} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
8. \(\begin{align} & 12 + 47\\= & \color{green}{10} + \color{red}{2} + \color{green}{40} + \color{red}{7} \\= & \color{green}{50} + \color{red}{9} \\= & \color{red}{59} \end{align}\)
9. \(\begin{align} & 67 + 31\\= & \color{green}{60} + \color{red}{7} + \color{green}{30} + \color{red}{1} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
10. \(\begin{align} & 66 + 33\\= & \color{green}{60} + \color{red}{6} + \color{green}{30} + \color{red}{3} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
11. \(\begin{align} & 13 + 23\\= & \color{green}{10} + \color{red}{3} + \color{green}{20} + \color{red}{3} \\= & \color{green}{30} + \color{red}{6} \\= & \color{red}{36} \end{align}\)
12. \(\begin{align} & 88 + 11\\= & \color{green}{80} + \color{red}{8} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)