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1. \(38 + 31 = \ldots\)
2. \(25 + 42 = \ldots\)
3. \(16 + 20 = \ldots\)
4. \(56 + 12 = \ldots\)
5. \(53 + 35 = \ldots\)
6. \(57 + 22 = \ldots\)
7. \(58 + 31 = \ldots\)
8. \(35 + 52 = \ldots\)
9. \(65 + 20 = \ldots\)
10. \(48 + 10 = \ldots\)
11. \(66 + 30 = \ldots\)
12. \(27 + 41 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 38 + 31\\= & \color{green}{30} + \color{red}{8} + \color{green}{30} + \color{red}{1} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
2. \(\begin{align} & 25 + 42\\= & \color{green}{20} + \color{red}{5} + \color{green}{40} + \color{red}{2} \\= & \color{green}{60} + \color{red}{7} \\= & \color{red}{67} \end{align}\)
3. \(\begin{align} & 16 + 20\\= &20+16\\= &20 + \color{green}{10} + \color{red}{6} \\= & \color{green}{30} + \color{red}{6} \\= & \color{red}{36} \end{align}\)
4. \(\begin{align} & 56 + 12\\= & \color{green}{50} + \color{red}{6} + \color{green}{10} + \color{red}{2} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)
5. \(\begin{align} & 53 + 35\\= & \color{green}{50} + \color{red}{3} + \color{green}{30} + \color{red}{5} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
6. \(\begin{align} & 57 + 22\\= & \color{green}{50} + \color{red}{7} + \color{green}{20} + \color{red}{2} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
7. \(\begin{align} & 58 + 31\\= & \color{green}{50} + \color{red}{8} + \color{green}{30} + \color{red}{1} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
8. \(\begin{align} & 35 + 52\\= & \color{green}{30} + \color{red}{5} + \color{green}{50} + \color{red}{2} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
9. \(\begin{align} & 65 + 20\\= &20+65\\= &20 + \color{green}{60} + \color{red}{5} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
10. \(\begin{align} & 48 + 10\\= &10+48\\= &10 + \color{green}{40} + \color{red}{8} \\= & \color{green}{50} + \color{red}{8} \\= & \color{red}{58} \end{align}\)
11. \(\begin{align} & 66 + 30\\= &30+66\\= &30 + \color{green}{60} + \color{red}{6} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
12. \(\begin{align} & 27 + 41\\= & \color{green}{20} + \color{red}{7} + \color{green}{40} + \color{red}{1} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)