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1. \(75 + 12 = \ldots\)
2. \(25 + 50 = \ldots\)
3. \(45 + 44 = \ldots\)
4. \(63 + 10 = \ldots\)
5. \(66 + 12 = \ldots\)
6. \(28 + 71 = \ldots\)
7. \(24 + 33 = \ldots\)
8. \(56 + 22 = \ldots\)
9. \(19 + 30 = \ldots\)
10. \(32 + 52 = \ldots\)
11. \(24 + 34 = \ldots\)
12. \(87 + 11 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 75 + 12\\= & \color{green}{70} + \color{red}{5} + \color{green}{10} + \color{red}{2} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
2. \(\begin{align} & 25 + 50\\= &50+25\\= &50 + \color{green}{20} + \color{red}{5} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
3. \(\begin{align} & 45 + 44\\= & \color{green}{40} + \color{red}{5} + \color{green}{40} + \color{red}{4} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
4. \(\begin{align} & 63 + 10\\= &10+63\\= &10 + \color{green}{60} + \color{red}{3} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
5. \(\begin{align} & 66 + 12\\= & \color{green}{60} + \color{red}{6} + \color{green}{10} + \color{red}{2} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
6. \(\begin{align} & 28 + 71\\= & \color{green}{20} + \color{red}{8} + \color{green}{70} + \color{red}{1} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
7. \(\begin{align} & 24 + 33\\= & \color{green}{20} + \color{red}{4} + \color{green}{30} + \color{red}{3} \\= & \color{green}{50} + \color{red}{7} \\= & \color{red}{57} \end{align}\)
8. \(\begin{align} & 56 + 22\\= & \color{green}{50} + \color{red}{6} + \color{green}{20} + \color{red}{2} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
9. \(\begin{align} & 19 + 30\\= &30+19\\= &30 + \color{green}{10} + \color{red}{9} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)
10. \(\begin{align} & 32 + 52\\= & \color{green}{30} + \color{red}{2} + \color{green}{50} + \color{red}{2} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
11. \(\begin{align} & 24 + 34\\= & \color{green}{20} + \color{red}{4} + \color{green}{30} + \color{red}{4} \\= & \color{green}{50} + \color{red}{8} \\= & \color{red}{58} \end{align}\)
12. \(\begin{align} & 87 + 11\\= & \color{green}{80} + \color{red}{7} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)