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1. \(74 + 12 = \ldots\)
2. \(16 + 42 = \ldots\)
3. \(28 + 30 = \ldots\)
4. \(64 + 11 = \ldots\)
5. \(35 + 14 = \ldots\)
6. \(76 + 12 = \ldots\)
7. \(23 + 75 = \ldots\)
8. \(44 + 31 = \ldots\)
9. \(13 + 24 = \ldots\)
10. \(37 + 42 = \ldots\)
11. \(72 + 27 = \ldots\)
12. \(78 + 11 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 74 + 12\\= & \color{green}{70} + \color{red}{4} + \color{green}{10} + \color{red}{2} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
2. \(\begin{align} & 16 + 42\\= & \color{green}{10} + \color{red}{6} + \color{green}{40} + \color{red}{2} \\= & \color{green}{50} + \color{red}{8} \\= & \color{red}{58} \end{align}\)
3. \(\begin{align} & 28 + 30\\= &30+28\\= &30 + \color{green}{20} + \color{red}{8} \\= & \color{green}{50} + \color{red}{8} \\= & \color{red}{58} \end{align}\)
4. \(\begin{align} & 64 + 11\\= & \color{green}{60} + \color{red}{4} + \color{green}{10} + \color{red}{1} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
5. \(\begin{align} & 35 + 14\\= & \color{green}{30} + \color{red}{5} + \color{green}{10} + \color{red}{4} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)
6. \(\begin{align} & 76 + 12\\= & \color{green}{70} + \color{red}{6} + \color{green}{10} + \color{red}{2} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
7. \(\begin{align} & 23 + 75\\= & \color{green}{20} + \color{red}{3} + \color{green}{70} + \color{red}{5} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
8. \(\begin{align} & 44 + 31\\= & \color{green}{40} + \color{red}{4} + \color{green}{30} + \color{red}{1} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
9. \(\begin{align} & 13 + 24\\= & \color{green}{10} + \color{red}{3} + \color{green}{20} + \color{red}{4} \\= & \color{green}{30} + \color{red}{7} \\= & \color{red}{37} \end{align}\)
10. \(\begin{align} & 37 + 42\\= & \color{green}{30} + \color{red}{7} + \color{green}{40} + \color{red}{2} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
11. \(\begin{align} & 72 + 27\\= & \color{green}{70} + \color{red}{2} + \color{green}{20} + \color{red}{7} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
12. \(\begin{align} & 78 + 11\\= & \color{green}{70} + \color{red}{8} + \color{green}{10} + \color{red}{1} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)