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1. \(40 + 55 = \ldots\)
2. \(36 + 20 = \ldots\)
3. \(58 + 10 = \ldots\)
4. \(80 + 11 = \ldots\)
5. \(59 + 30 = \ldots\)
6. \(22 + 50 = \ldots\)
7. \(60 + 25 = \ldots\)
8. \(18 + 70 = \ldots\)
9. \(20 + 48 = \ldots\)
10. \(97 + 10 = \ldots\)
11. \(10 + 95 = \ldots\)
12. \(10 + 55 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 40 + 55 \\= & 40 + \color{green}{50} + \color{red}{5} \\ = & \color{green}{90} + \color{red}{5} \\ = & \color{red}{95} \end{align}\)
2. \(\begin{align} & 36 + 20 \\ = & 20 + 36 \\= & 20 + \color{green}{30} + \color{red}{6} \\ = & \color{green}{50} + \color{red}{6} \\ = & \color{red}{56} \end{align}\)
3. \(\begin{align} & 58 + 10 \\ = & 10 + 58 \\= & 10 + \color{green}{50} + \color{red}{8} \\ = & \color{green}{60} + \color{red}{8} \\ = & \color{red}{68} \end{align}\)
4. \(\begin{align} & 80 + 11 \\= & 80 + \color{green}{10} + \color{red}{1} \\ = & \color{green}{90} + \color{red}{1} \\ = & \color{red}{91} \end{align}\)
5. \(\begin{align} & 59 + 30 \\ = & 30 + 59 \\= & 30 + \color{green}{50} + \color{red}{9} \\ = & \color{green}{80} + \color{red}{9} \\ = & \color{red}{89} \end{align}\)
6. \(\begin{align} & 22 + 50 \\ = & 50 + 22 \\= & 50 + \color{green}{20} + \color{red}{2} \\ = & \color{green}{70} + \color{red}{2} \\ = & \color{red}{72} \end{align}\)
7. \(\begin{align} & 60 + 25 \\= & 60 + \color{green}{20} + \color{red}{5} \\ = & \color{green}{80} + \color{red}{5} \\ = & \color{red}{85} \end{align}\)
8. \(\begin{align} & 18 + 70 \\ = & 70 + 18 \\= & 70 + \color{green}{10} + \color{red}{8} \\ = & \color{green}{80} + \color{red}{8} \\ = & \color{red}{88} \end{align}\)
9. \(\begin{align} & 20 + 48 \\= & 20 + \color{green}{40} + \color{red}{8} \\ = & \color{green}{60} + \color{red}{8} \\ = & \color{red}{68} \end{align}\)
10. \(\begin{align} & 97 + 10 \\ = & 10 + 97 \\= & 10 + \color{green}{90} + \color{red}{7} \\ = & \color{green}{100} + \color{red}{7} \\ = & \color{red}{107} \end{align}\)
11. \(\begin{align} & 10 + 95 \\= & 10 + \color{green}{90} + \color{red}{5} \\ = & \color{green}{100} + \color{red}{5} \\ = & \color{red}{105} \end{align}\)
12. \(\begin{align} & 10 + 55 \\= & 10 + \color{green}{50} + \color{red}{5} \\ = & \color{green}{60} + \color{red}{5} \\ = & \color{red}{65} \end{align}\)