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1. \(46 + 41 = \ldots\)
2. \(69 + 20 = \ldots\)
3. \(39 + 40 = \ldots\)
4. \(58 + 30 = \ldots\)
5. \(80 + 13 = \ldots\)
6. \(31 + 60 = \ldots\)
7. \(22 + 73 = \ldots\)
8. \(17 + 61 = \ldots\)
9. \(73 + 12 = \ldots\)
10. \(70 + 24 = \ldots\)
11. \(46 + 21 = \ldots\)
12. \(52 + 11 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 46 + 41\\= & \color{green}{40} + \color{red}{6} + \color{green}{40} + \color{red}{1} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
2. \(\begin{align} & 69 + 20\\= &20+69\\= &20 + \color{green}{60} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
3. \(\begin{align} & 39 + 40\\= &40+39\\= &40 + \color{green}{30} + \color{red}{9} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
4. \(\begin{align} & 58 + 30\\= &30+58\\= &30 + \color{green}{50} + \color{red}{8} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
5. \(\begin{align} & 80 + 13\\= &80 + \color{green}{10} + \color{red}{3} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
6. \(\begin{align} & 31 + 60\\= &60+31\\= &60 + \color{green}{30} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
7. \(\begin{align} & 22 + 73\\= & \color{green}{20} + \color{red}{2} + \color{green}{70} + \color{red}{3} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
8. \(\begin{align} & 17 + 61\\= & \color{green}{10} + \color{red}{7} + \color{green}{60} + \color{red}{1} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
9. \(\begin{align} & 73 + 12\\= & \color{green}{70} + \color{red}{3} + \color{green}{10} + \color{red}{2} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
10. \(\begin{align} & 70 + 24\\= &70 + \color{green}{20} + \color{red}{4} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
11. \(\begin{align} & 46 + 21\\= & \color{green}{40} + \color{red}{6} + \color{green}{20} + \color{red}{1} \\= & \color{green}{60} + \color{red}{7} \\= & \color{red}{67} \end{align}\)
12. \(\begin{align} & 52 + 11\\= & \color{green}{50} + \color{red}{2} + \color{green}{10} + \color{red}{1} \\= & \color{green}{60} + \color{red}{3} \\= & \color{red}{63} \end{align}\)