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1. \(81 + 10 = \ldots\)
2. \(30 + 19 = \ldots\)
3. \(46 + 41 = \ldots\)
4. \(70 + 20 = \ldots\)
5. \(84 + 13 = \ldots\)
6. \(45 + 22 = \ldots\)
7. \(54 + 25 = \ldots\)
8. \(54 + 24 = \ldots\)
9. \(62 + 35 = \ldots\)
10. \(70 + 27 = \ldots\)
11. \(70 + 10 = \ldots\)
12. \(53 + 25 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 81 + 10\\= &10+81\\= &10 + \color{green}{80} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
2. \(\begin{align} & 30 + 19\\= &30 + \color{green}{10} + \color{red}{9} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)
3. \(\begin{align} & 46 + 41\\= & \color{green}{40} + \color{red}{6} + \color{green}{40} + \color{red}{1} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
4. \(\begin{align} & 70 + 20\\= &70 + \color{green}{20} + \color{red}{0} \\= & \color{green}{90} + \color{red}{0} \\= & \color{red}{90} \end{align}\)
5. \(\begin{align} & 84 + 13\\= & \color{green}{80} + \color{red}{4} + \color{green}{10} + \color{red}{3} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
6. \(\begin{align} & 45 + 22\\= & \color{green}{40} + \color{red}{5} + \color{green}{20} + \color{red}{2} \\= & \color{green}{60} + \color{red}{7} \\= & \color{red}{67} \end{align}\)
7. \(\begin{align} & 54 + 25\\= & \color{green}{50} + \color{red}{4} + \color{green}{20} + \color{red}{5} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
8. \(\begin{align} & 54 + 24\\= & \color{green}{50} + \color{red}{4} + \color{green}{20} + \color{red}{4} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
9. \(\begin{align} & 62 + 35\\= & \color{green}{60} + \color{red}{2} + \color{green}{30} + \color{red}{5} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
10. \(\begin{align} & 70 + 27\\= &70 + \color{green}{20} + \color{red}{7} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
11. \(\begin{align} & 70 + 10\\= &70 + \color{green}{10} + \color{red}{0} \\= & \color{green}{80} + \color{red}{0} \\= & \color{red}{80} \end{align}\)
12. \(\begin{align} & 53 + 25\\= & \color{green}{50} + \color{red}{3} + \color{green}{20} + \color{red}{5} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)