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1. \(17 + 40 = \ldots\)
2. \(32 + 60 = \ldots\)
3. \(20 + 42 = \ldots\)
4. \(20 + 67 = \ldots\)
5. \(50 + 43 = \ldots\)
6. \(40 + 51 = \ldots\)
7. \(19 + 50 = \ldots\)
8. \(10 + 54 = \ldots\)
9. \(11 + 80 = \ldots\)
10. \(40 + 24 = \ldots\)
11. \(30 + 57 = \ldots\)
12. \(50 + 27 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 17 + 40 \\ = & 40 + 17 \\= & 40 + \color{green}{10} + \color{red}{7} \\ = & \color{green}{50} + \color{red}{7} \\ = & \color{red}{57} \end{align}\)
2. \(\begin{align} & 32 + 60 \\ = & 60 + 32 \\= & 60 + \color{green}{30} + \color{red}{2} \\ = & \color{green}{90} + \color{red}{2} \\ = & \color{red}{92} \end{align}\)
3. \(\begin{align} & 20 + 42 \\= & 20 + \color{green}{40} + \color{red}{2} \\ = & \color{green}{60} + \color{red}{2} \\ = & \color{red}{62} \end{align}\)
4. \(\begin{align} & 20 + 67 \\= & 20 + \color{green}{60} + \color{red}{7} \\ = & \color{green}{80} + \color{red}{7} \\ = & \color{red}{87} \end{align}\)
5. \(\begin{align} & 50 + 43 \\= & 50 + \color{green}{40} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}\)
6. \(\begin{align} & 40 + 51 \\= & 40 + \color{green}{50} + \color{red}{1} \\ = & \color{green}{90} + \color{red}{1} \\ = & \color{red}{91} \end{align}\)
7. \(\begin{align} & 19 + 50 \\ = & 50 + 19 \\= & 50 + \color{green}{10} + \color{red}{9} \\ = & \color{green}{60} + \color{red}{9} \\ = & \color{red}{69} \end{align}\)
8. \(\begin{align} & 10 + 54 \\= & 10 + \color{green}{50} + \color{red}{4} \\ = & \color{green}{60} + \color{red}{4} \\ = & \color{red}{64} \end{align}\)
9. \(\begin{align} & 11 + 80 \\ = & 80 + 11 \\= & 80 + \color{green}{10} + \color{red}{1} \\ = & \color{green}{90} + \color{red}{1} \\ = & \color{red}{91} \end{align}\)
10. \(\begin{align} & 40 + 24 \\= & 40 + \color{green}{20} + \color{red}{4} \\ = & \color{green}{60} + \color{red}{4} \\ = & \color{red}{64} \end{align}\)
11. \(\begin{align} & 30 + 57 \\= & 30 + \color{green}{50} + \color{red}{7} \\ = & \color{green}{80} + \color{red}{7} \\ = & \color{red}{87} \end{align}\)
12. \(\begin{align} & 50 + 27 \\= & 50 + \color{green}{20} + \color{red}{7} \\ = & \color{green}{70} + \color{red}{7} \\ = & \color{red}{77} \end{align}\)