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1. \(73 + 20 = \ldots\)
2. \(40 + 18 = \ldots\)
3. \(30 + 52 = \ldots\)
4. \(44 + 10 = \ldots\)
5. \(42 + 50 = \ldots\)
6. \(25 + 10 = \ldots\)
7. \(27 + 40 = \ldots\)
8. \(22 + 60 = \ldots\)
9. \(18 + 10 = \ldots\)
10. \(30 + 43 = \ldots\)
11. \(50 + 27 = \ldots\)
12. \(10 + 96 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 73 + 20 \\ = & 20 + 73 \\= & 20 + \color{green}{70} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}\)
2. \(\begin{align} & 40 + 18 \\= & 40 + \color{green}{10} + \color{red}{8} \\ = & \color{green}{50} + \color{red}{8} \\ = & \color{red}{58} \end{align}\)
3. \(\begin{align} & 30 + 52 \\= & 30 + \color{green}{50} + \color{red}{2} \\ = & \color{green}{80} + \color{red}{2} \\ = & \color{red}{82} \end{align}\)
4. \(\begin{align} & 44 + 10 \\ = & 10 + 44 \\= & 10 + \color{green}{40} + \color{red}{4} \\ = & \color{green}{50} + \color{red}{4} \\ = & \color{red}{54} \end{align}\)
5. \(\begin{align} & 42 + 50 \\ = & 50 + 42 \\= & 50 + \color{green}{40} + \color{red}{2} \\ = & \color{green}{90} + \color{red}{2} \\ = & \color{red}{92} \end{align}\)
6. \(\begin{align} & 25 + 10 \\ = & 10 + 25 \\= & 10 + \color{green}{20} + \color{red}{5} \\ = & \color{green}{30} + \color{red}{5} \\ = & \color{red}{35} \end{align}\)
7. \(\begin{align} & 27 + 40 \\ = & 40 + 27 \\= & 40 + \color{green}{20} + \color{red}{7} \\ = & \color{green}{60} + \color{red}{7} \\ = & \color{red}{67} \end{align}\)
8. \(\begin{align} & 22 + 60 \\ = & 60 + 22 \\= & 60 + \color{green}{20} + \color{red}{2} \\ = & \color{green}{80} + \color{red}{2} \\ = & \color{red}{82} \end{align}\)
9. \(\begin{align} & 18 + 10 \\ = & 10 + 18 \\= & 10 + \color{green}{10} + \color{red}{8} \\ = & \color{green}{20} + \color{red}{8} \\ = & \color{red}{28} \end{align}\)
10. \(\begin{align} & 30 + 43 \\= & 30 + \color{green}{40} + \color{red}{3} \\ = & \color{green}{70} + \color{red}{3} \\ = & \color{red}{73} \end{align}\)
11. \(\begin{align} & 50 + 27 \\= & 50 + \color{green}{20} + \color{red}{7} \\ = & \color{green}{70} + \color{red}{7} \\ = & \color{red}{77} \end{align}\)
12. \(\begin{align} & 10 + 96 \\= & 10 + \color{green}{90} + \color{red}{6} \\ = & \color{green}{100} + \color{red}{6} \\ = & \color{red}{106} \end{align}\)