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1. \(41 + 20 = \ldots\)
2. \(29 + 50 = \ldots\)
3. \(60 + 36 = \ldots\)
4. \(14 + 40 = \ldots\)
5. \(40 + 24 = \ldots\)
6. \(10 + 97 = \ldots\)
7. \(29 + 30 = \ldots\)
8. \(10 + 55 = \ldots\)
9. \(10 + 73 = \ldots\)
10. \(44 + 30 = \ldots\)
11. \(20 + 73 = \ldots\)
12. \(30 + 42 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 41 + 20 \\ = & 20 + 41 \\= & 20 + \color{green}{40} + \color{red}{1} \\ = & \color{green}{60} + \color{red}{1} \\ = & \color{red}{61} \end{align}\)
2. \(\begin{align} & 29 + 50 \\ = & 50 + 29 \\= & 50 + \color{green}{20} + \color{red}{9} \\ = & \color{green}{70} + \color{red}{9} \\ = & \color{red}{79} \end{align}\)
3. \(\begin{align} & 60 + 36 \\= & 60 + \color{green}{30} + \color{red}{6} \\ = & \color{green}{90} + \color{red}{6} \\ = & \color{red}{96} \end{align}\)
4. \(\begin{align} & 14 + 40 \\ = & 40 + 14 \\= & 40 + \color{green}{10} + \color{red}{4} \\ = & \color{green}{50} + \color{red}{4} \\ = & \color{red}{54} \end{align}\)
5. \(\begin{align} & 40 + 24 \\= & 40 + \color{green}{20} + \color{red}{4} \\ = & \color{green}{60} + \color{red}{4} \\ = & \color{red}{64} \end{align}\)
6. \(\begin{align} & 10 + 97 \\= & 10 + \color{green}{90} + \color{red}{7} \\ = & \color{green}{100} + \color{red}{7} \\ = & \color{red}{107} \end{align}\)
7. \(\begin{align} & 29 + 30 \\ = & 30 + 29 \\= & 30 + \color{green}{20} + \color{red}{9} \\ = & \color{green}{50} + \color{red}{9} \\ = & \color{red}{59} \end{align}\)
8. \(\begin{align} & 10 + 55 \\= & 10 + \color{green}{50} + \color{red}{5} \\ = & \color{green}{60} + \color{red}{5} \\ = & \color{red}{65} \end{align}\)
9. \(\begin{align} & 10 + 73 \\= & 10 + \color{green}{70} + \color{red}{3} \\ = & \color{green}{80} + \color{red}{3} \\ = & \color{red}{83} \end{align}\)
10. \(\begin{align} & 44 + 30 \\ = & 30 + 44 \\= & 30 + \color{green}{40} + \color{red}{4} \\ = & \color{green}{70} + \color{red}{4} \\ = & \color{red}{74} \end{align}\)
11. \(\begin{align} & 20 + 73 \\= & 20 + \color{green}{70} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}\)
12. \(\begin{align} & 30 + 42 \\= & 30 + \color{green}{40} + \color{red}{2} \\ = & \color{green}{70} + \color{red}{2} \\ = & \color{red}{72} \end{align}\)