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1. \(79 + 20 = \ldots\)
2. \(13 + 83 = \ldots\)
3. \(44 + 42 = \ldots\)
4. \(32 + 33 = \ldots\)
5. \(29 + 30 = \ldots\)
6. \(70 + 22 = \ldots\)
7. \(79 + 10 = \ldots\)
8. \(57 + 42 = \ldots\)
9. \(30 + 67 = \ldots\)
10. \(46 + 53 = \ldots\)
11. \(82 + 14 = \ldots\)
12. \(76 + 12 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 79 + 20\\= &20+79\\= &20 + \color{green}{70} + \color{red}{9} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
2. \(\begin{align} & 13 + 83\\= & \color{green}{10} + \color{red}{3} + \color{green}{80} + \color{red}{3} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
3. \(\begin{align} & 44 + 42\\= & \color{green}{40} + \color{red}{4} + \color{green}{40} + \color{red}{2} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
4. \(\begin{align} & 32 + 33\\= & \color{green}{30} + \color{red}{2} + \color{green}{30} + \color{red}{3} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
5. \(\begin{align} & 29 + 30\\= &30+29\\= &30 + \color{green}{20} + \color{red}{9} \\= & \color{green}{50} + \color{red}{9} \\= & \color{red}{59} \end{align}\)
6. \(\begin{align} & 70 + 22\\= &70 + \color{green}{20} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
7. \(\begin{align} & 79 + 10\\= &10+79\\= &10 + \color{green}{70} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
8. \(\begin{align} & 57 + 42\\= & \color{green}{50} + \color{red}{7} + \color{green}{40} + \color{red}{2} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
9. \(\begin{align} & 30 + 67\\= &30 + \color{green}{60} + \color{red}{7} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
10. \(\begin{align} & 46 + 53\\= & \color{green}{40} + \color{red}{6} + \color{green}{50} + \color{red}{3} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
11. \(\begin{align} & 82 + 14\\= & \color{green}{80} + \color{red}{2} + \color{green}{10} + \color{red}{4} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
12. \(\begin{align} & 76 + 12\\= & \color{green}{70} + \color{red}{6} + \color{green}{10} + \color{red}{2} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)