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1. \(84 + 10 = \ldots\)
2. \(84 + 15 = \ldots\)
3. \(72 + 21 = \ldots\)
4. \(85 + 12 = \ldots\)
5. \(50 + 17 = \ldots\)
6. \(87 + 10 = \ldots\)
7. \(11 + 21 = \ldots\)
8. \(42 + 45 = \ldots\)
9. \(27 + 51 = \ldots\)
10. \(23 + 42 = \ldots\)
11. \(24 + 25 = \ldots\)
12. \(62 + 23 = \ldots\)

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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. \(\begin{align} & 84 + 15\\= & \color{green}{80} + \color{red}{4} + \color{green}{10} + \color{red}{5} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
3. \(\begin{align} & 72 + 21\\= & \color{green}{70} + \color{red}{2} + \color{green}{20} + \color{red}{1} \\= & \color{green}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
4. \(\begin{align} & 85 + 12\\= & \color{green}{80} + \color{red}{5} + \color{green}{10} + \color{red}{2} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
5. \(\begin{align} & 50 + 17\\= &50 + \color{green}{10} + \color{red}{7} \\= & \color{green}{60} + \color{red}{7} \\= & \color{red}{67} \end{align}\)
6. \(\begin{align} & 87 + 10\\= &10+87\\= &10 + \color{green}{80} + \color{red}{7} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
7. \(\begin{align} & 11 + 21\\= & \color{green}{10} + \color{red}{1} + \color{green}{20} + \color{red}{1} \\= & \color{green}{30} + \color{red}{2} \\= & \color{red}{32} \end{align}\)
8. \(\begin{align} & 42 + 45\\= & \color{green}{40} + \color{red}{2} + \color{green}{40} + \color{red}{5} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
9. \(\begin{align} & 27 + 51\\= & \color{green}{20} + \color{red}{7} + \color{green}{50} + \color{red}{1} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
10. \(\begin{align} & 23 + 42\\= & \color{green}{20} + \color{red}{3} + \color{green}{40} + \color{red}{2} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
11. \(\begin{align} & 24 + 25\\= & \color{green}{20} + \color{red}{4} + \color{green}{20} + \color{red}{5} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)
12. \(\begin{align} & 62 + 23\\= & \color{green}{60} + \color{red}{2} + \color{green}{20} + \color{red}{3} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)