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1. \(49 + 20 = \ldots\)
2. \(44 + 11 = \ldots\)
3. \(14 + 61 = \ldots\)
4. \(36 + 11 = \ldots\)
5. \(68 + 20 = \ldots\)
6. \(59 + 10 = \ldots\)
7. \(18 + 80 = \ldots\)
8. \(41 + 26 = \ldots\)
9. \(61 + 16 = \ldots\)
10. \(50 + 21 = \ldots\)
11. \(12 + 80 = \ldots\)
12. \(28 + 11 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 49 + 20\\= &20+49\\= &20 + \color{green}{40} + \color{red}{9} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
2. \(\begin{align} & 44 + 11\\= & \color{green}{40} + \color{red}{4} + \color{green}{10} + \color{red}{1} \\= & \color{green}{50} + \color{red}{5} \\= & \color{red}{55} \end{align}\)
3. \(\begin{align} & 14 + 61\\= & \color{green}{10} + \color{red}{4} + \color{green}{60} + \color{red}{1} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
4. \(\begin{align} & 36 + 11\\= & \color{green}{30} + \color{red}{6} + \color{green}{10} + \color{red}{1} \\= & \color{green}{40} + \color{red}{7} \\= & \color{red}{47} \end{align}\)
5. \(\begin{align} & 68 + 20\\= &20+68\\= &20 + \color{green}{60} + \color{red}{8} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
6. \(\begin{align} & 59 + 10\\= &10+59\\= &10 + \color{green}{50} + \color{red}{9} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
7. \(\begin{align} & 18 + 80\\= &80+18\\= &80 + \color{green}{10} + \color{red}{8} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
8. \(\begin{align} & 41 + 26\\= & \color{green}{40} + \color{red}{1} + \color{green}{20} + \color{red}{6} \\= & \color{green}{60} + \color{red}{7} \\= & \color{red}{67} \end{align}\)
9. \(\begin{align} & 61 + 16\\= & \color{green}{60} + \color{red}{1} + \color{green}{10} + \color{red}{6} \\= & \color{green}{70} + \color{red}{7} \\= & \color{red}{77} \end{align}\)
10. \(\begin{align} & 50 + 21\\= &50 + \color{green}{20} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
11. \(\begin{align} & 12 + 80\\= &80+12\\= &80 + \color{green}{10} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
12. \(\begin{align} & 28 + 11\\= & \color{green}{20} + \color{red}{8} + \color{green}{10} + \color{red}{1} \\= & \color{green}{30} + \color{red}{9} \\= & \color{red}{39} \end{align}\)