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1. \(53 + 40 = \ldots\)
2. \(36 + 10 = \ldots\)
3. \(20 + 21 = \ldots\)
4. \(45 + 50 = \ldots\)
5. \(55 + 10 = \ldots\)
6. \(38 + 50 = \ldots\)
7. \(47 + 50 = \ldots\)
8. \(34 + 10 = \ldots\)
9. \(10 + 31 = \ldots\)
10. \(43 + 40 = \ldots\)
11. \(81 + 10 = \ldots\)
12. \(14 + 70 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 53 + 40 \\ = & 40 + 53 \\= & 40 + \color{green}{50} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}\)
2. \(\begin{align} & 36 + 10 \\ = & 10 + 36 \\= & 10 + \color{green}{30} + \color{red}{6} \\ = & \color{green}{40} + \color{red}{6} \\ = & \color{red}{46} \end{align}\)
3. \(\begin{align} & 20 + 21 \\= & 20 + \color{green}{20} + \color{red}{1} \\ = & \color{green}{40} + \color{red}{1} \\ = & \color{red}{41} \end{align}\)
4. \(\begin{align} & 45 + 50 \\ = & 50 + 45 \\= & 50 + \color{green}{40} + \color{red}{5} \\ = & \color{green}{90} + \color{red}{5} \\ = & \color{red}{95} \end{align}\)
5. \(\begin{align} & 55 + 10 \\ = & 10 + 55 \\= & 10 + \color{green}{50} + \color{red}{5} \\ = & \color{green}{60} + \color{red}{5} \\ = & \color{red}{65} \end{align}\)
6. \(\begin{align} & 38 + 50 \\ = & 50 + 38 \\= & 50 + \color{green}{30} + \color{red}{8} \\ = & \color{green}{80} + \color{red}{8} \\ = & \color{red}{88} \end{align}\)
7. \(\begin{align} & 47 + 50 \\ = & 50 + 47 \\= & 50 + \color{green}{40} + \color{red}{7} \\ = & \color{green}{90} + \color{red}{7} \\ = & \color{red}{97} \end{align}\)
8. \(\begin{align} & 34 + 10 \\ = & 10 + 34 \\= & 10 + \color{green}{30} + \color{red}{4} \\ = & \color{green}{40} + \color{red}{4} \\ = & \color{red}{44} \end{align}\)
9. \(\begin{align} & 10 + 31 \\= & 10 + \color{green}{30} + \color{red}{1} \\ = & \color{green}{40} + \color{red}{1} \\ = & \color{red}{41} \end{align}\)
10. \(\begin{align} & 43 + 40 \\ = & 40 + 43 \\= & 40 + \color{green}{40} + \color{red}{3} \\ = & \color{green}{80} + \color{red}{3} \\ = & \color{red}{83} \end{align}\)
11. \(\begin{align} & 81 + 10 \\ = & 10 + 81 \\= & 10 + \color{green}{80} + \color{red}{1} \\ = & \color{green}{90} + \color{red}{1} \\ = & \color{red}{91} \end{align}\)
12. \(\begin{align} & 14 + 70 \\ = & 70 + 14 \\= & 70 + \color{green}{10} + \color{red}{4} \\ = & \color{green}{80} + \color{red}{4} \\ = & \color{red}{84} \end{align}\)