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1. \(83 + 15 = \ldots\)
2. \(65 + 24 = \ldots\)
3. \(32 + 35 = \ldots\)
4. \(40 + 57 = \ldots\)
5. \(78 + 21 = \ldots\)
6. \(20 + 37 = \ldots\)
7. \(88 + 10 = \ldots\)
8. \(21 + 25 = \ldots\)
9. \(53 + 10 = \ldots\)
10. \(59 + 30 = \ldots\)
11. \(34 + 24 = \ldots\)
12. \(30 + 38 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 83 + 15\\= & \color{green}{80} + \color{red}{3} + \color{green}{10} + \color{red}{5} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
2. \(\begin{align} & 65 + 24\\= & \color{green}{60} + \color{red}{5} + \color{green}{20} + \color{red}{4} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
3. \(\begin{align} & 32 + 35\\= & \color{green}{30} + \color{red}{2} + \color{green}{30} + \color{red}{5} \\= & \color{green}{60} + \color{red}{7} \\= & \color{red}{67} \end{align}\)
4. \(\begin{align} & 40 + 57\\= &40 + \color{green}{50} + \color{red}{7} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
5. \(\begin{align} & 78 + 21\\= & \color{green}{70} + \color{red}{8} + \color{green}{20} + \color{red}{1} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
6. \(\begin{align} & 20 + 37\\= &20 + \color{green}{30} + \color{red}{7} \\= & \color{green}{50} + \color{red}{7} \\= & \color{red}{57} \end{align}\)
7. \(\begin{align} & 88 + 10\\= &10+88\\= &10 + \color{green}{80} + \color{red}{8} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
8. \(\begin{align} & 21 + 25\\= & \color{green}{20} + \color{red}{1} + \color{green}{20} + \color{red}{5} \\= & \color{green}{40} + \color{red}{6} \\= & \color{red}{46} \end{align}\)
9. \(\begin{align} & 53 + 10\\= &10+53\\= &10 + \color{green}{50} + \color{red}{3} \\= & \color{green}{60} + \color{red}{3} \\= & \color{red}{63} \end{align}\)
10. \(\begin{align} & 59 + 30\\= &30+59\\= &30 + \color{green}{50} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
11. \(\begin{align} & 34 + 24\\= & \color{green}{30} + \color{red}{4} + \color{green}{20} + \color{red}{4} \\= & \color{green}{50} + \color{red}{8} \\= & \color{red}{58} \end{align}\)
12. \(\begin{align} & 30 + 38\\= &30 + \color{green}{30} + \color{red}{8} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)