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1. \(10 + 87 = \ldots\)
2. \(20 + 66 = \ldots\)
3. \(64 + 10 = \ldots\)
4. \(22 + 50 = \ldots\)
5. \(10 + 85 = \ldots\)
6. \(30 + 13 = \ldots\)
7. \(50 + 15 = \ldots\)
8. \(23 + 30 = \ldots\)
9. \(53 + 20 = \ldots\)
10. \(80 + 12 = \ldots\)
11. \(34 + 20 = \ldots\)
12. \(10 + 74 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 10 + 87 \\= & 10 + \color{green}{80} + \color{red}{7} \\ = & \color{green}{90} + \color{red}{7} \\ = & \color{red}{97} \end{align}\)
2. \(\begin{align} & 20 + 66 \\= & 20 + \color{green}{60} + \color{red}{6} \\ = & \color{green}{80} + \color{red}{6} \\ = & \color{red}{86} \end{align}\)
3. \(\begin{align} & 64 + 10 \\ = & 10 + 64 \\= & 10 + \color{green}{60} + \color{red}{4} \\ = & \color{green}{70} + \color{red}{4} \\ = & \color{red}{74} \end{align}\)
4. \(\begin{align} & 22 + 50 \\ = & 50 + 22 \\= & 50 + \color{green}{20} + \color{red}{2} \\ = & \color{green}{70} + \color{red}{2} \\ = & \color{red}{72} \end{align}\)
5. \(\begin{align} & 10 + 85 \\= & 10 + \color{green}{80} + \color{red}{5} \\ = & \color{green}{90} + \color{red}{5} \\ = & \color{red}{95} \end{align}\)
6. \(\begin{align} & 30 + 13 \\= & 30 + \color{green}{10} + \color{red}{3} \\ = & \color{green}{40} + \color{red}{3} \\ = & \color{red}{43} \end{align}\)
7. \(\begin{align} & 50 + 15 \\= & 50 + \color{green}{10} + \color{red}{5} \\ = & \color{green}{60} + \color{red}{5} \\ = & \color{red}{65} \end{align}\)
8. \(\begin{align} & 23 + 30 \\ = & 30 + 23 \\= & 30 + \color{green}{20} + \color{red}{3} \\ = & \color{green}{50} + \color{red}{3} \\ = & \color{red}{53} \end{align}\)
9. \(\begin{align} & 53 + 20 \\ = & 20 + 53 \\= & 20 + \color{green}{50} + \color{red}{3} \\ = & \color{green}{70} + \color{red}{3} \\ = & \color{red}{73} \end{align}\)
10. \(\begin{align} & 80 + 12 \\= & 80 + \color{green}{10} + \color{red}{2} \\ = & \color{green}{90} + \color{red}{2} \\ = & \color{red}{92} \end{align}\)
11. \(\begin{align} & 34 + 20 \\ = & 20 + 34 \\= & 20 + \color{green}{30} + \color{red}{4} \\ = & \color{green}{50} + \color{red}{4} \\ = & \color{red}{54} \end{align}\)
12. \(\begin{align} & 10 + 74 \\= & 10 + \color{green}{70} + \color{red}{4} \\ = & \color{green}{80} + \color{red}{4} \\ = & \color{red}{84} \end{align}\)