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1. \(84 + 10 = \ldots\)
2. \(72 + 27 = \ldots\)
3. \(52 + 41 = \ldots\)
4. \(21 + 44 = \ldots\)
5. \(38 + 40 = \ldots\)
6. \(25 + 70 = \ldots\)
7. \(74 + 13 = \ldots\)
8. \(68 + 30 = \ldots\)
9. \(60 + 27 = \ldots\)
10. \(87 + 10 = \ldots\)
11. \(28 + 10 = \ldots\)
12. \(41 + 54 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 84 + 10\\= &10+84\\= &10 + \color{green}{80} + \color{red}{4} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
2. \(\begin{align} & 72 + 27\\= & \color{green}{70} + \color{red}{2} + \color{green}{20} + \color{red}{7} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
3. \(\begin{align} & 52 + 41\\= & \color{green}{50} + \color{red}{2} + \color{green}{40} + \color{red}{1} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
4. \(\begin{align} & 21 + 44\\= & \color{green}{20} + \color{red}{1} + \color{green}{40} + \color{red}{4} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
5. \(\begin{align} & 38 + 40\\= &40+38\\= &40 + \color{green}{30} + \color{red}{8} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
6. \(\begin{align} & 25 + 70\\= &70+25\\= &70 + \color{green}{20} + \color{red}{5} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
7. \(\begin{align} & 74 + 13\\= & \color{green}{70} + \color{red}{4} + \color{green}{10} + \color{red}{3} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
8. \(\begin{align} & 68 + 30\\= &30+68\\= &30 + \color{green}{60} + \color{red}{8} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
9. \(\begin{align} & 60 + 27\\= &60 + \color{green}{20} + \color{red}{7} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
10. \(\begin{align} & 87 + 10\\= &10+87\\= &10 + \color{green}{80} + \color{red}{7} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
11. \(\begin{align} & 28 + 10\\= &10+28\\= &10 + \color{green}{20} + \color{red}{8} \\= & \color{green}{30} + \color{red}{8} \\= & \color{red}{38} \end{align}\)
12. \(\begin{align} & 41 + 54\\= & \color{green}{40} + \color{red}{1} + \color{green}{50} + \color{red}{4} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)