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1. \(80 + 13 = \ldots\)
2. \(83 + 11 = \ldots\)
3. \(76 + 12 = \ldots\)
4. \(25 + 23 = \ldots\)
5. \(13 + 73 = \ldots\)
6. \(68 + 30 = \ldots\)
7. \(12 + 77 = \ldots\)
8. \(39 + 50 = \ldots\)
9. \(40 + 36 = \ldots\)
10. \(79 + 20 = \ldots\)
11. \(88 + 11 = \ldots\)
12. \(17 + 12 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 80 + 13\\= &80 + \color{green}{10} + \color{red}{3} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
2. \(\begin{align} & 83 + 11\\= & \color{green}{80} + \color{red}{3} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
3. \(\begin{align} & 76 + 12\\= & \color{green}{70} + \color{red}{6} + \color{green}{10} + \color{red}{2} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
4. \(\begin{align} & 25 + 23\\= & \color{green}{20} + \color{red}{5} + \color{green}{20} + \color{red}{3} \\= & \color{green}{40} + \color{red}{8} \\= & \color{red}{48} \end{align}\)
5. \(\begin{align} & 13 + 73\\= & \color{green}{10} + \color{red}{3} + \color{green}{70} + \color{red}{3} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
6. \(\begin{align} & 68 + 30\\= &30+68\\= &30 + \color{green}{60} + \color{red}{8} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
7. \(\begin{align} & 12 + 77\\= & \color{green}{10} + \color{red}{2} + \color{green}{70} + \color{red}{7} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
8. \(\begin{align} & 39 + 50\\= &50+39\\= &50 + \color{green}{30} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
9. \(\begin{align} & 40 + 36\\= &40 + \color{green}{30} + \color{red}{6} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)
10. \(\begin{align} & 79 + 20\\= &20+79\\= &20 + \color{green}{70} + \color{red}{9} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
11. \(\begin{align} & 88 + 11\\= & \color{green}{80} + \color{red}{8} + \color{green}{10} + \color{red}{1} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
12. \(\begin{align} & 17 + 12\\= & \color{green}{10} + \color{red}{7} + \color{green}{10} + \color{red}{2} \\= & \color{green}{20} + \color{red}{9} \\= & \color{red}{29} \end{align}\)