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1. \(84 + 14 = \ldots\)
2. \(22 + 61 = \ldots\)
3. \(46 + 41 = \ldots\)
4. \(33 + 34 = \ldots\)
5. \(52 + 31 = \ldots\)
6. \(27 + 22 = \ldots\)
7. \(38 + 11 = \ldots\)
8. \(20 + 28 = \ldots\)
9. \(38 + 30 = \ldots\)
10. \(67 + 21 = \ldots\)
11. \(23 + 60 = \ldots\)
12. \(48 + 20 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 84 + 14\\= & \color{green}{80} + \color{red}{4} + \color{green}{10} + \color{red}{4} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
2. \(\begin{align} & 22 + 61\\= & \color{green}{20} + \color{red}{2} + \color{green}{60} + \color{red}{1} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
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. \(\begin{align} & 33 + 34\\= & \color{green}{30} + \color{red}{3} + \color{green}{30} + \color{red}{4} \\= & \color{green}{60} + \color{red}{7} \\= & \color{red}{67} \end{align}\)
5. \(\begin{align} & 52 + 31\\= & \color{green}{50} + \color{red}{2} + \color{green}{30} + \color{red}{1} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
6. \(\begin{align} & 27 + 22\\= & \color{green}{20} + \color{red}{7} + \color{green}{20} + \color{red}{2} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)
7. \(\begin{align} & 38 + 11\\= & \color{green}{30} + \color{red}{8} + \color{green}{10} + \color{red}{1} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)
8. \(\begin{align} & 20 + 28\\= &20 + \color{green}{20} + \color{red}{8} \\= & \color{green}{40} + \color{red}{8} \\= & \color{red}{48} \end{align}\)
9. \(\begin{align} & 38 + 30\\= &30+38\\= &30 + \color{green}{30} + \color{red}{8} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)
10. \(\begin{align} & 67 + 21\\= & \color{green}{60} + \color{red}{7} + \color{green}{20} + \color{red}{1} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
11. \(\begin{align} & 23 + 60\\= &60+23\\= &60 + \color{green}{20} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
12. \(\begin{align} & 48 + 20\\= &20+48\\= &20 + \color{green}{40} + \color{red}{8} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)