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1. \(55 + 40 = \ldots\)
2. \(40 + 21 = \ldots\)
3. \(41 + 30 = \ldots\)
4. \(10 + 23 = \ldots\)
5. \(30 + 45 = \ldots\)
6. \(10 + 17 = \ldots\)
7. \(36 + 20 = \ldots\)
8. \(10 + 46 = \ldots\)
9. \(77 + 10 = \ldots\)
10. \(69 + 20 = \ldots\)
11. \(10 + 36 = \ldots\)
12. \(78 + 10 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 55 + 40 \\ = & 40 + 55 \\= & 40 + \color{green}{50} + \color{red}{5} \\ = & \color{green}{90} + \color{red}{5} \\ = & \color{red}{95} \end{align}\)
2. \(\begin{align} & 40 + 21 \\= & 40 + \color{green}{20} + \color{red}{1} \\ = & \color{green}{60} + \color{red}{1} \\ = & \color{red}{61} \end{align}\)
3. \(\begin{align} & 41 + 30 \\ = & 30 + 41 \\= & 30 + \color{green}{40} + \color{red}{1} \\ = & \color{green}{70} + \color{red}{1} \\ = & \color{red}{71} \end{align}\)
4. \(\begin{align} & 10 + 23 \\= & 10 + \color{green}{20} + \color{red}{3} \\ = & \color{green}{30} + \color{red}{3} \\ = & \color{red}{33} \end{align}\)
5. \(\begin{align} & 30 + 45 \\= & 30 + \color{green}{40} + \color{red}{5} \\ = & \color{green}{70} + \color{red}{5} \\ = & \color{red}{75} \end{align}\)
6. \(\begin{align} & 10 + 17 \\= & 10 + \color{green}{10} + \color{red}{7} \\ = & \color{green}{20} + \color{red}{7} \\ = & \color{red}{27} \end{align}\)
7. \(\begin{align} & 36 + 20 \\ = & 20 + 36 \\= & 20 + \color{green}{30} + \color{red}{6} \\ = & \color{green}{50} + \color{red}{6} \\ = & \color{red}{56} \end{align}\)
8. \(\begin{align} & 10 + 46 \\= & 10 + \color{green}{40} + \color{red}{6} \\ = & \color{green}{50} + \color{red}{6} \\ = & \color{red}{56} \end{align}\)
9. \(\begin{align} & 77 + 10 \\ = & 10 + 77 \\= & 10 + \color{green}{70} + \color{red}{7} \\ = & \color{green}{80} + \color{red}{7} \\ = & \color{red}{87} \end{align}\)
10. \(\begin{align} & 69 + 20 \\ = & 20 + 69 \\= & 20 + \color{green}{60} + \color{red}{9} \\ = & \color{green}{80} + \color{red}{9} \\ = & \color{red}{89} \end{align}\)
11. \(\begin{align} & 10 + 36 \\= & 10 + \color{green}{30} + \color{red}{6} \\ = & \color{green}{40} + \color{red}{6} \\ = & \color{red}{46} \end{align}\)
12. \(\begin{align} & 78 + 10 \\ = & 10 + 78 \\= & 10 + \color{green}{70} + \color{red}{8} \\ = & \color{green}{80} + \color{red}{8} \\ = & \color{red}{88} \end{align}\)