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1. \(49 + 10 = \ldots\)
2. \(13 + 62 = \ldots\)
3. \(63 + 23 = \ldots\)
4. \(51 + 10 = \ldots\)
5. \(58 + 41 = \ldots\)
6. \(48 + 10 = \ldots\)
7. \(64 + 24 = \ldots\)
8. \(58 + 30 = \ldots\)
9. \(34 + 54 = \ldots\)
10. \(63 + 11 = \ldots\)
11. \(74 + 21 = \ldots\)
12. \(79 + 20 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 49 + 10\\= &10+49\\= &10 + \color{green}{40} + \color{red}{9} \\= & \color{green}{50} + \color{red}{9} \\= & \color{red}{59} \end{align}\)
2. \(\begin{align} & 13 + 62\\= & \color{green}{10} + \color{red}{3} + \color{green}{60} + \color{red}{2} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
3. \(\begin{align} & 63 + 23\\= & \color{green}{60} + \color{red}{3} + \color{green}{20} + \color{red}{3} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
4. \(\begin{align} & 51 + 10\\= &10+51\\= &10 + \color{green}{50} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
5. \(\begin{align} & 58 + 41\\= & \color{green}{50} + \color{red}{8} + \color{green}{40} + \color{red}{1} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
6. \(\begin{align} & 48 + 10\\= &10+48\\= &10 + \color{green}{40} + \color{red}{8} \\= & \color{green}{50} + \color{red}{8} \\= & \color{red}{58} \end{align}\)
7. \(\begin{align} & 64 + 24\\= & \color{green}{60} + \color{red}{4} + \color{green}{20} + \color{red}{4} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
8. \(\begin{align} & 58 + 30\\= &30+58\\= &30 + \color{green}{50} + \color{red}{8} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
9. \(\begin{align} & 34 + 54\\= & \color{green}{30} + \color{red}{4} + \color{green}{50} + \color{red}{4} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
10. \(\begin{align} & 63 + 11\\= & \color{green}{60} + \color{red}{3} + \color{green}{10} + \color{red}{1} \\= & \color{green}{70} + \color{red}{4} \\= & \color{red}{74} \end{align}\)
11. \(\begin{align} & 74 + 21\\= & \color{green}{70} + \color{red}{4} + \color{green}{20} + \color{red}{1} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
12. \(\begin{align} & 79 + 20\\= &20+79\\= &20 + \color{green}{70} + \color{red}{9} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)