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1. \(39 + 50 = \ldots\)
2. \(61 + 16 = \ldots\)
3. \(65 + 20 = \ldots\)
4. \(64 + 35 = \ldots\)
5. \(66 + 33 = \ldots\)
6. \(71 + 10 = \ldots\)
7. \(42 + 24 = \ldots\)
8. \(31 + 40 = \ldots\)
9. \(43 + 43 = \ldots\)
10. \(31 + 58 = \ldots\)
11. \(57 + 40 = \ldots\)
12. \(28 + 61 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 39 + 50\\= &50+39\\= &50 + \color{green}{30} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
2. \(\begin{align} & 61 + 16\\= & \color{green}{60} + \color{red}{1} + \color{green}{10} + \color{red}{6} \\= & \color{green}{70} + \color{red}{7} \\= & \color{red}{77} \end{align}\)
3. \(\begin{align} & 65 + 20\\= &20+65\\= &20 + \color{green}{60} + \color{red}{5} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
4. \(\begin{align} & 64 + 35\\= & \color{green}{60} + \color{red}{4} + \color{green}{30} + \color{red}{5} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
5. \(\begin{align} & 66 + 33\\= & \color{green}{60} + \color{red}{6} + \color{green}{30} + \color{red}{3} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
6. \(\begin{align} & 71 + 10\\= &10+71\\= &10 + \color{green}{70} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
7. \(\begin{align} & 42 + 24\\= & \color{green}{40} + \color{red}{2} + \color{green}{20} + \color{red}{4} \\= & \color{green}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)
8. \(\begin{align} & 31 + 40\\= &40+31\\= &40 + \color{green}{30} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
9. \(\begin{align} & 43 + 43\\= & \color{green}{40} + \color{red}{3} + \color{green}{40} + \color{red}{3} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
10. \(\begin{align} & 31 + 58\\= & \color{green}{30} + \color{red}{1} + \color{green}{50} + \color{red}{8} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
11. \(\begin{align} & 57 + 40\\= &40+57\\= &40 + \color{green}{50} + \color{red}{7} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
12. \(\begin{align} & 28 + 61\\= & \color{green}{20} + \color{red}{8} + \color{green}{60} + \color{red}{1} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)