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1. \(51 + 14 = \ldots\)
2. \(16 + 33 = \ldots\)
3. \(15 + 10 = \ldots\)
4. \(60 + 30 = \ldots\)
5. \(85 + 11 = \ldots\)
6. \(79 + 10 = \ldots\)
7. \(16 + 73 = \ldots\)
8. \(74 + 22 = \ldots\)
9. \(31 + 28 = \ldots\)
10. \(34 + 11 = \ldots\)
11. \(76 + 10 = \ldots\)
12. \(66 + 33 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 51 + 14\\= & \color{green}{50} + \color{red}{1} + \color{green}{10} + \color{red}{4} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
2. \(\begin{align} & 16 + 33\\= & \color{green}{10} + \color{red}{6} + \color{green}{30} + \color{red}{3} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)
3. \(\begin{align} & 15 + 10\\= &10+15\\= &10 + \color{green}{10} + \color{red}{5} \\= & \color{green}{20} + \color{red}{5} \\= & \color{red}{25} \end{align}\)
4. \(\begin{align} & 60 + 30\\= &60 + \color{green}{30} + \color{red}{0} \\= & \color{green}{90} + \color{red}{0} \\= & \color{red}{90} \end{align}\)
5. \(\begin{align} & 85 + 11\\= & \color{green}{80} + \color{red}{5} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
6. \(\begin{align} & 79 + 10\\= &10+79\\= &10 + \color{green}{70} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
7. \(\begin{align} & 16 + 73\\= & \color{green}{10} + \color{red}{6} + \color{green}{70} + \color{red}{3} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
8. \(\begin{align} & 74 + 22\\= & \color{green}{70} + \color{red}{4} + \color{green}{20} + \color{red}{2} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
9. \(\begin{align} & 31 + 28\\= & \color{green}{30} + \color{red}{1} + \color{green}{20} + \color{red}{8} \\= & \color{green}{50} + \color{red}{9} \\= & \color{red}{59} \end{align}\)
10. \(\begin{align} & 34 + 11\\= & \color{green}{30} + \color{red}{4} + \color{green}{10} + \color{red}{1} \\= & \color{green}{40} + \color{red}{5} \\= & \color{red}{45} \end{align}\)
11. \(\begin{align} & 76 + 10\\= &10+76\\= &10 + \color{green}{70} + \color{red}{6} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
12. \(\begin{align} & 66 + 33\\= & \color{green}{60} + \color{red}{6} + \color{green}{30} + \color{red}{3} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)