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1. \(50 + 43 = \ldots\)
2. \(50 + 12 = \ldots\)
3. \(10 + 46 = \ldots\)
4. \(53 + 10 = \ldots\)
5. \(40 + 24 = \ldots\)
6. \(10 + 51 = \ldots\)
7. \(30 + 45 = \ldots\)
8. \(20 + 45 = \ldots\)
9. \(49 + 50 = \ldots\)
10. \(22 + 20 = \ldots\)
11. \(50 + 48 = \ldots\)
12. \(20 + 29 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 50 + 43 \\= & 50 + \color{green}{40} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}\)
2. \(\begin{align} & 50 + 12 \\= & 50 + \color{green}{10} + \color{red}{2} \\ = & \color{green}{60} + \color{red}{2} \\ = & \color{red}{62} \end{align}\)
3. \(\begin{align} & 10 + 46 \\= & 10 + \color{green}{40} + \color{red}{6} \\ = & \color{green}{50} + \color{red}{6} \\ = & \color{red}{56} \end{align}\)
4. \(\begin{align} & 53 + 10 \\ = & 10 + 53 \\= & 10 + \color{green}{50} + \color{red}{3} \\ = & \color{green}{60} + \color{red}{3} \\ = & \color{red}{63} \end{align}\)
5. \(\begin{align} & 40 + 24 \\= & 40 + \color{green}{20} + \color{red}{4} \\ = & \color{green}{60} + \color{red}{4} \\ = & \color{red}{64} \end{align}\)
6. \(\begin{align} & 10 + 51 \\= & 10 + \color{green}{50} + \color{red}{1} \\ = & \color{green}{60} + \color{red}{1} \\ = & \color{red}{61} \end{align}\)
7. \(\begin{align} & 30 + 45 \\= & 30 + \color{green}{40} + \color{red}{5} \\ = & \color{green}{70} + \color{red}{5} \\ = & \color{red}{75} \end{align}\)
8. \(\begin{align} & 20 + 45 \\= & 20 + \color{green}{40} + \color{red}{5} \\ = & \color{green}{60} + \color{red}{5} \\ = & \color{red}{65} \end{align}\)
9. \(\begin{align} & 49 + 50 \\ = & 50 + 49 \\= & 50 + \color{green}{40} + \color{red}{9} \\ = & \color{green}{90} + \color{red}{9} \\ = & \color{red}{99} \end{align}\)
10. \(\begin{align} & 22 + 20 \\ = & 20 + 22 \\= & 20 + \color{green}{20} + \color{red}{2} \\ = & \color{green}{40} + \color{red}{2} \\ = & \color{red}{42} \end{align}\)
11. \(\begin{align} & 50 + 48 \\= & 50 + \color{green}{40} + \color{red}{8} \\ = & \color{green}{90} + \color{red}{8} \\ = & \color{red}{98} \end{align}\)
12. \(\begin{align} & 20 + 29 \\= & 20 + \color{green}{20} + \color{red}{9} \\ = & \color{green}{40} + \color{red}{9} \\ = & \color{red}{49} \end{align}\)