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1. \(61 + 15 = \ldots\)
2. \(69 + 30 = \ldots\)
3. \(70 + 21 = \ldots\)
4. \(65 + 31 = \ldots\)
5. \(37 + 12 = \ldots\)
6. \(32 + 62 = \ldots\)
7. \(53 + 23 = \ldots\)
8. \(18 + 20 = \ldots\)
9. \(82 + 17 = \ldots\)
10. \(47 + 52 = \ldots\)
11. \(40 + 55 = \ldots\)
12. \(27 + 21 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 61 + 15\\= & \color{green}{60} + \color{red}{1} + \color{green}{10} + \color{red}{5} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)
2. \(\begin{align} & 69 + 30\\= &30+69\\= &30 + \color{green}{60} + \color{red}{9} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
3. \(\begin{align} & 70 + 21\\= &70 + \color{green}{20} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
4. \(\begin{align} & 65 + 31\\= & \color{green}{60} + \color{red}{5} + \color{green}{30} + \color{red}{1} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
5. \(\begin{align} & 37 + 12\\= & \color{green}{30} + \color{red}{7} + \color{green}{10} + \color{red}{2} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)
6. \(\begin{align} & 32 + 62\\= & \color{green}{30} + \color{red}{2} + \color{green}{60} + \color{red}{2} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
7. \(\begin{align} & 53 + 23\\= & \color{green}{50} + \color{red}{3} + \color{green}{20} + \color{red}{3} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)
8. \(\begin{align} & 18 + 20\\= &20+18\\= &20 + \color{green}{10} + \color{red}{8} \\= & \color{green}{30} + \color{red}{8} \\= & \color{red}{38} \end{align}\)
9. \(\begin{align} & 82 + 17\\= & \color{green}{80} + \color{red}{2} + \color{green}{10} + \color{red}{7} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
10. \(\begin{align} & 47 + 52\\= & \color{green}{40} + \color{red}{7} + \color{green}{50} + \color{red}{2} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
11. \(\begin{align} & 40 + 55\\= &40 + \color{green}{50} + \color{red}{5} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
12. \(\begin{align} & 27 + 21\\= & \color{green}{20} + \color{red}{7} + \color{green}{20} + \color{red}{1} \\= & \color{green}{40} + \color{red}{8} \\= & \color{red}{48} \end{align}\)