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1. \(53 + 40 = \ldots\)
2. \(30 + 47 = \ldots\)
3. \(20 + 42 = \ldots\)
4. \(0 + 96 = \ldots\)
5. \(38 + 10 = \ldots\)
6. \(20 + 45 = \ldots\)
7. \(28 + 70 = \ldots\)
8. \(30 + 58 = \ldots\)
9. \(31 + 60 = \ldots\)
10. \(34 + 20 = \ldots\)
11. \(15 + 20 = \ldots\)
12. \(50 + 21 = \ldots\)

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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. \(\begin{align} & 30 + 47 \\= & 30 + \color{green}{40} + \color{red}{7} \\ = & \color{green}{70} + \color{red}{7} \\ = & \color{red}{77} \end{align}\)
3. \(\begin{align} & 20 + 42 \\= & 20 + \color{green}{40} + \color{red}{2} \\ = & \color{green}{60} + \color{red}{2} \\ = & \color{red}{62} \end{align}\)
4. \(\begin{align} & 0 + 96 \\= & 0 + \color{green}{90} + \color{red}{6} \\ = & \color{green}{90} + \color{red}{6} \\ = & \color{red}{96} \end{align}\)
5. \(\begin{align} & 38 + 10 \\ = & 10 + 38 \\= & 10 + \color{green}{30} + \color{red}{8} \\ = & \color{green}{40} + \color{red}{8} \\ = & \color{red}{48} \end{align}\)
6. \(\begin{align} & 20 + 45 \\= & 20 + \color{green}{40} + \color{red}{5} \\ = & \color{green}{60} + \color{red}{5} \\ = & \color{red}{65} \end{align}\)
7. \(\begin{align} & 28 + 70 \\ = & 70 + 28 \\= & 70 + \color{green}{20} + \color{red}{8} \\ = & \color{green}{90} + \color{red}{8} \\ = & \color{red}{98} \end{align}\)
8. \(\begin{align} & 30 + 58 \\= & 30 + \color{green}{50} + \color{red}{8} \\ = & \color{green}{80} + \color{red}{8} \\ = & \color{red}{88} \end{align}\)
9. \(\begin{align} & 31 + 60 \\ = & 60 + 31 \\= & 60 + \color{green}{30} + \color{red}{1} \\ = & \color{green}{90} + \color{red}{1} \\ = & \color{red}{91} \end{align}\)
10. \(\begin{align} & 34 + 20 \\ = & 20 + 34 \\= & 20 + \color{green}{30} + \color{red}{4} \\ = & \color{green}{50} + \color{red}{4} \\ = & \color{red}{54} \end{align}\)
11. \(\begin{align} & 15 + 20 \\ = & 20 + 15 \\= & 20 + \color{green}{10} + \color{red}{5} \\ = & \color{green}{30} + \color{red}{5} \\ = & \color{red}{35} \end{align}\)
12. \(\begin{align} & 50 + 21 \\= & 50 + \color{green}{20} + \color{red}{1} \\ = & \color{green}{70} + \color{red}{1} \\ = & \color{red}{71} \end{align}\)