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1. \(80 + 14 = \ldots\)
2. \(82 + 16 = \ldots\)
3. \(81 + 13 = \ldots\)
4. \(32 + 47 = \ldots\)
5. \(19 + 30 = \ldots\)
6. \(29 + 20 = \ldots\)
7. \(59 + 40 = \ldots\)
8. \(43 + 41 = \ldots\)
9. \(69 + 20 = \ldots\)
10. \(30 + 28 = \ldots\)
11. \(41 + 52 = \ldots\)
12. \(53 + 13 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 80 + 14\\= &80 + \color{green}{10} + \color{red}{4} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
2. \(\begin{align} & 82 + 16\\= & \color{green}{80} + \color{red}{2} + \color{green}{10} + \color{red}{6} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
3. \(\begin{align} & 81 + 13\\= & \color{green}{80} + \color{red}{1} + \color{green}{10} + \color{red}{3} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
4. \(\begin{align} & 32 + 47\\= & \color{green}{30} + \color{red}{2} + \color{green}{40} + \color{red}{7} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
5. \(\begin{align} & 19 + 30\\= &30+19\\= &30 + \color{green}{10} + \color{red}{9} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)
6. \(\begin{align} & 29 + 20\\= &20+29\\= &20 + \color{green}{20} + \color{red}{9} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)
7. \(\begin{align} & 59 + 40\\= &40+59\\= &40 + \color{green}{50} + \color{red}{9} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
8. \(\begin{align} & 43 + 41\\= & \color{green}{40} + \color{red}{3} + \color{green}{40} + \color{red}{1} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
9. \(\begin{align} & 69 + 20\\= &20+69\\= &20 + \color{green}{60} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
10. \(\begin{align} & 30 + 28\\= &30 + \color{green}{20} + \color{red}{8} \\= & \color{green}{50} + \color{red}{8} \\= & \color{red}{58} \end{align}\)
11. \(\begin{align} & 41 + 52\\= & \color{green}{40} + \color{red}{1} + \color{green}{50} + \color{red}{2} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
12. \(\begin{align} & 53 + 13\\= & \color{green}{50} + \color{red}{3} + \color{green}{10} + \color{red}{3} \\= & \color{green}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)