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1. \(44 + 45 = \ldots\)
2. \(23 + 16 = \ldots\)
3. \(69 + 10 = \ldots\)
4. \(82 + 12 = \ldots\)
5. \(39 + 50 = \ldots\)
6. \(28 + 71 = \ldots\)
7. \(50 + 42 = \ldots\)
8. \(10 + 66 = \ldots\)
9. \(65 + 32 = \ldots\)
10. \(56 + 31 = \ldots\)
11. \(85 + 13 = \ldots\)
12. \(51 + 45 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 44 + 45\\= & \color{green}{40} + \color{red}{4} + \color{green}{40} + \color{red}{5} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
2. \(\begin{align} & 23 + 16\\= & \color{green}{20} + \color{red}{3} + \color{green}{10} + \color{red}{6} \\= & \color{green}{30} + \color{red}{9} \\= & \color{red}{39} \end{align}\)
3. \(\begin{align} & 69 + 10\\= &10+69\\= &10 + \color{green}{60} + \color{red}{9} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
4. \(\begin{align} & 82 + 12\\= & \color{green}{80} + \color{red}{2} + \color{green}{10} + \color{red}{2} \\= & \color{green}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
5. \(\begin{align} & 39 + 50\\= &50+39\\= &50 + \color{green}{30} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
6. \(\begin{align} & 28 + 71\\= & \color{green}{20} + \color{red}{8} + \color{green}{70} + \color{red}{1} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
7. \(\begin{align} & 50 + 42\\= &50 + \color{green}{40} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
8. \(\begin{align} & 10 + 66\\= &10 + \color{green}{60} + \color{red}{6} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)
9. \(\begin{align} & 65 + 32\\= & \color{green}{60} + \color{red}{5} + \color{green}{30} + \color{red}{2} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
10. \(\begin{align} & 56 + 31\\= & \color{green}{50} + \color{red}{6} + \color{green}{30} + \color{red}{1} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
11. \(\begin{align} & 85 + 13\\= & \color{green}{80} + \color{red}{5} + \color{green}{10} + \color{red}{3} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
12. \(\begin{align} & 51 + 45\\= & \color{green}{50} + \color{red}{1} + \color{green}{40} + \color{red}{5} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)