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1. \(43 + 20 = \ldots\)
2. \(16 + 40 = \ldots\)
3. \(34 + 50 = \ldots\)
4. \(33 + 30 = \ldots\)
5. \(52 + 10 = \ldots\)
6. \(0 + 97 = \ldots\)
7. \(59 + 40 = \ldots\)
8. \(30 + 35 = \ldots\)
9. \(30 + 58 = \ldots\)
10. \(20 + 11 = \ldots\)
11. \(30 + 15 = \ldots\)
12. \(60 + 32 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 43 + 20 \\ = & 20 + 43 \\= & 20 + \color{green}{40} + \color{red}{3} \\ = & \color{green}{60} + \color{red}{3} \\ = & \color{red}{63} \end{align}\)
2. \(\begin{align} & 16 + 40 \\ = & 40 + 16 \\= & 40 + \color{green}{10} + \color{red}{6} \\ = & \color{green}{50} + \color{red}{6} \\ = & \color{red}{56} \end{align}\)
3. \(\begin{align} & 34 + 50 \\ = & 50 + 34 \\= & 50 + \color{green}{30} + \color{red}{4} \\ = & \color{green}{80} + \color{red}{4} \\ = & \color{red}{84} \end{align}\)
4. \(\begin{align} & 33 + 30 \\ = & 30 + 33 \\= & 30 + \color{green}{30} + \color{red}{3} \\ = & \color{green}{60} + \color{red}{3} \\ = & \color{red}{63} \end{align}\)
5. \(\begin{align} & 52 + 10 \\ = & 10 + 52 \\= & 10 + \color{green}{50} + \color{red}{2} \\ = & \color{green}{60} + \color{red}{2} \\ = & \color{red}{62} \end{align}\)
6. \(\begin{align} & 0 + 97 \\= & 0 + \color{green}{90} + \color{red}{7} \\ = & \color{green}{90} + \color{red}{7} \\ = & \color{red}{97} \end{align}\)
7. \(\begin{align} & 59 + 40 \\ = & 40 + 59 \\= & 40 + \color{green}{50} + \color{red}{9} \\ = & \color{green}{90} + \color{red}{9} \\ = & \color{red}{99} \end{align}\)
8. \(\begin{align} & 30 + 35 \\= & 30 + \color{green}{30} + \color{red}{5} \\ = & \color{green}{60} + \color{red}{5} \\ = & \color{red}{65} \end{align}\)
9. \(\begin{align} & 30 + 58 \\= & 30 + \color{green}{50} + \color{red}{8} \\ = & \color{green}{80} + \color{red}{8} \\ = & \color{red}{88} \end{align}\)
10. \(\begin{align} & 20 + 11 \\= & 20 + \color{green}{10} + \color{red}{1} \\ = & \color{green}{30} + \color{red}{1} \\ = & \color{red}{31} \end{align}\)
11. \(\begin{align} & 30 + 15 \\= & 30 + \color{green}{10} + \color{red}{5} \\ = & \color{green}{40} + \color{red}{5} \\ = & \color{red}{45} \end{align}\)
12. \(\begin{align} & 60 + 32 \\= & 60 + \color{green}{30} + \color{red}{2} \\ = & \color{green}{90} + \color{red}{2} \\ = & \color{red}{92} \end{align}\)