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1. \(13 + 40 = \ldots\)
2. \(50 + 44 = \ldots\)
3. \(33 + 10 = \ldots\)
4. \(10 + 22 = \ldots\)
5. \(40 + 33 = \ldots\)
6. \(70 + 24 = \ldots\)
7. \(40 + 24 = \ldots\)
8. \(55 + 20 = \ldots\)
9. \(70 + 23 = \ldots\)
10. \(50 + 17 = \ldots\)
11. \(45 + 30 = \ldots\)
12. \(56 + 20 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 13 + 40 \\ = & 40 + 13 \\= & 40 + \color{green}{10} + \color{red}{3} \\ = & \color{green}{50} + \color{red}{3} \\ = & \color{red}{53} \end{align}\)
2. \(\begin{align} & 50 + 44 \\= & 50 + \color{green}{40} + \color{red}{4} \\ = & \color{green}{90} + \color{red}{4} \\ = & \color{red}{94} \end{align}\)
3. \(\begin{align} & 33 + 10 \\ = & 10 + 33 \\= & 10 + \color{green}{30} + \color{red}{3} \\ = & \color{green}{40} + \color{red}{3} \\ = & \color{red}{43} \end{align}\)
4. \(\begin{align} & 10 + 22 \\= & 10 + \color{green}{20} + \color{red}{2} \\ = & \color{green}{30} + \color{red}{2} \\ = & \color{red}{32} \end{align}\)
5. \(\begin{align} & 40 + 33 \\= & 40 + \color{green}{30} + \color{red}{3} \\ = & \color{green}{70} + \color{red}{3} \\ = & \color{red}{73} \end{align}\)
6. \(\begin{align} & 70 + 24 \\= & 70 + \color{green}{20} + \color{red}{4} \\ = & \color{green}{90} + \color{red}{4} \\ = & \color{red}{94} \end{align}\)
7. \(\begin{align} & 40 + 24 \\= & 40 + \color{green}{20} + \color{red}{4} \\ = & \color{green}{60} + \color{red}{4} \\ = & \color{red}{64} \end{align}\)
8. \(\begin{align} & 55 + 20 \\ = & 20 + 55 \\= & 20 + \color{green}{50} + \color{red}{5} \\ = & \color{green}{70} + \color{red}{5} \\ = & \color{red}{75} \end{align}\)
9. \(\begin{align} & 70 + 23 \\= & 70 + \color{green}{20} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}\)
10. \(\begin{align} & 50 + 17 \\= & 50 + \color{green}{10} + \color{red}{7} \\ = & \color{green}{60} + \color{red}{7} \\ = & \color{red}{67} \end{align}\)
11. \(\begin{align} & 45 + 30 \\ = & 30 + 45 \\= & 30 + \color{green}{40} + \color{red}{5} \\ = & \color{green}{70} + \color{red}{5} \\ = & \color{red}{75} \end{align}\)
12. \(\begin{align} & 56 + 20 \\ = & 20 + 56 \\= & 20 + \color{green}{50} + \color{red}{6} \\ = & \color{green}{70} + \color{red}{6} \\ = & \color{red}{76} \end{align}\)