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1. \(72 + 27 = \ldots\)
2. \(49 + 30 = \ldots\)
3. \(37 + 42 = \ldots\)
4. \(17 + 10 = \ldots\)
5. \(25 + 64 = \ldots\)
6. \(70 + 12 = \ldots\)
7. \(84 + 10 = \ldots\)
8. \(87 + 11 = \ldots\)
9. \(70 + 26 = \ldots\)
10. \(48 + 30 = \ldots\)
11. \(17 + 40 = \ldots\)
12. \(66 + 32 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 72 + 27\\= & \color{green}{70} + \color{red}{2} + \color{green}{20} + \color{red}{7} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
2. \(\begin{align} & 49 + 30\\= &30+49\\= &30 + \color{green}{40} + \color{red}{9} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
3. \(\begin{align} & 37 + 42\\= & \color{green}{30} + \color{red}{7} + \color{green}{40} + \color{red}{2} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
4. \(\begin{align} & 17 + 10\\= &10+17\\= &10 + \color{green}{10} + \color{red}{7} \\= & \color{green}{20} + \color{red}{7} \\= & \color{red}{27} \end{align}\)
5. \(\begin{align} & 25 + 64\\= & \color{green}{20} + \color{red}{5} + \color{green}{60} + \color{red}{4} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
6. \(\begin{align} & 70 + 12\\= &70 + \color{green}{10} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
7. \(\begin{align} & 84 + 10\\= &10+84\\= &10 + \color{green}{80} + \color{red}{4} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
8. \(\begin{align} & 87 + 11\\= & \color{green}{80} + \color{red}{7} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
9. \(\begin{align} & 70 + 26\\= &70 + \color{green}{20} + \color{red}{6} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
10. \(\begin{align} & 48 + 30\\= &30+48\\= &30 + \color{green}{40} + \color{red}{8} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
11. \(\begin{align} & 17 + 40\\= &40+17\\= &40 + \color{green}{10} + \color{red}{7} \\= & \color{green}{50} + \color{red}{7} \\= & \color{red}{57} \end{align}\)
12. \(\begin{align} & 66 + 32\\= & \color{green}{60} + \color{red}{6} + \color{green}{30} + \color{red}{2} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)