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1. \(20 + 58 = \ldots\)
2. \(10 + 59 = \ldots\)
3. \(49 + 30 = \ldots\)
4. \(30 + 44 = \ldots\)
5. \(18 + 60 = \ldots\)
6. \(20 + 34 = \ldots\)
7. \(58 + 10 = \ldots\)
8. \(15 + 30 = \ldots\)
9. \(81 + 10 = \ldots\)
10. \(20 + 15 = \ldots\)
11. \(30 + 36 = \ldots\)
12. \(66 + 30 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 20 + 58 \\= & 20 + \color{green}{50} + \color{red}{8} \\ = & \color{green}{70} + \color{red}{8} \\ = & \color{red}{78} \end{align}\)
2. \(\begin{align} & 10 + 59 \\= & 10 + \color{green}{50} + \color{red}{9} \\ = & \color{green}{60} + \color{red}{9} \\ = & \color{red}{69} \end{align}\)
3. \(\begin{align} & 49 + 30 \\ = & 30 + 49 \\= & 30 + \color{green}{40} + \color{red}{9} \\ = & \color{green}{70} + \color{red}{9} \\ = & \color{red}{79} \end{align}\)
4. \(\begin{align} & 30 + 44 \\= & 30 + \color{green}{40} + \color{red}{4} \\ = & \color{green}{70} + \color{red}{4} \\ = & \color{red}{74} \end{align}\)
5. \(\begin{align} & 18 + 60 \\ = & 60 + 18 \\= & 60 + \color{green}{10} + \color{red}{8} \\ = & \color{green}{70} + \color{red}{8} \\ = & \color{red}{78} \end{align}\)
6. \(\begin{align} & 20 + 34 \\= & 20 + \color{green}{30} + \color{red}{4} \\ = & \color{green}{50} + \color{red}{4} \\ = & \color{red}{54} \end{align}\)
7. \(\begin{align} & 58 + 10 \\ = & 10 + 58 \\= & 10 + \color{green}{50} + \color{red}{8} \\ = & \color{green}{60} + \color{red}{8} \\ = & \color{red}{68} \end{align}\)
8. \(\begin{align} & 15 + 30 \\ = & 30 + 15 \\= & 30 + \color{green}{10} + \color{red}{5} \\ = & \color{green}{40} + \color{red}{5} \\ = & \color{red}{45} \end{align}\)
9. \(\begin{align} & 81 + 10 \\ = & 10 + 81 \\= & 10 + \color{green}{80} + \color{red}{1} \\ = & \color{green}{90} + \color{red}{1} \\ = & \color{red}{91} \end{align}\)
10. \(\begin{align} & 20 + 15 \\= & 20 + \color{green}{10} + \color{red}{5} \\ = & \color{green}{30} + \color{red}{5} \\ = & \color{red}{35} \end{align}\)
11. \(\begin{align} & 30 + 36 \\= & 30 + \color{green}{30} + \color{red}{6} \\ = & \color{green}{60} + \color{red}{6} \\ = & \color{red}{66} \end{align}\)
12. \(\begin{align} & 66 + 30 \\ = & 30 + 66 \\= & 30 + \color{green}{60} + \color{red}{6} \\ = & \color{green}{90} + \color{red}{6} \\ = & \color{red}{96} \end{align}\)