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1. \(52 + 30 = \ldots\)
2. \(38 + 30 = \ldots\)
3. \(10 + 58 = \ldots\)
4. \(34 + 30 = \ldots\)
5. \(32 + 50 = \ldots\)
6. \(70 + 26 = \ldots\)
7. \(21 + 20 = \ldots\)
8. \(61 + 20 = \ldots\)
9. \(20 + 18 = \ldots\)
10. \(20 + 66 = \ldots\)
11. \(30 + 59 = \ldots\)
12. \(60 + 22 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 52 + 30 \\ = & 30 + 52 \\= & 30 + \color{green}{50} + \color{red}{2} \\ = & \color{green}{80} + \color{red}{2} \\ = & \color{red}{82} \end{align}\)
2. \(\begin{align} & 38 + 30 \\ = & 30 + 38 \\= & 30 + \color{green}{30} + \color{red}{8} \\ = & \color{green}{60} + \color{red}{8} \\ = & \color{red}{68} \end{align}\)
3. \(\begin{align} & 10 + 58 \\= & 10 + \color{green}{50} + \color{red}{8} \\ = & \color{green}{60} + \color{red}{8} \\ = & \color{red}{68} \end{align}\)
4. \(\begin{align} & 34 + 30 \\ = & 30 + 34 \\= & 30 + \color{green}{30} + \color{red}{4} \\ = & \color{green}{60} + \color{red}{4} \\ = & \color{red}{64} \end{align}\)
5. \(\begin{align} & 32 + 50 \\ = & 50 + 32 \\= & 50 + \color{green}{30} + \color{red}{2} \\ = & \color{green}{80} + \color{red}{2} \\ = & \color{red}{82} \end{align}\)
6. \(\begin{align} & 70 + 26 \\= & 70 + \color{green}{20} + \color{red}{6} \\ = & \color{green}{90} + \color{red}{6} \\ = & \color{red}{96} \end{align}\)
7. \(\begin{align} & 21 + 20 \\ = & 20 + 21 \\= & 20 + \color{green}{20} + \color{red}{1} \\ = & \color{green}{40} + \color{red}{1} \\ = & \color{red}{41} \end{align}\)
8. \(\begin{align} & 61 + 20 \\ = & 20 + 61 \\= & 20 + \color{green}{60} + \color{red}{1} \\ = & \color{green}{80} + \color{red}{1} \\ = & \color{red}{81} \end{align}\)
9. \(\begin{align} & 20 + 18 \\= & 20 + \color{green}{10} + \color{red}{8} \\ = & \color{green}{30} + \color{red}{8} \\ = & \color{red}{38} \end{align}\)
10. \(\begin{align} & 20 + 66 \\= & 20 + \color{green}{60} + \color{red}{6} \\ = & \color{green}{80} + \color{red}{6} \\ = & \color{red}{86} \end{align}\)
11. \(\begin{align} & 30 + 59 \\= & 30 + \color{green}{50} + \color{red}{9} \\ = & \color{green}{80} + \color{red}{9} \\ = & \color{red}{89} \end{align}\)
12. \(\begin{align} & 60 + 22 \\= & 60 + \color{green}{20} + \color{red}{2} \\ = & \color{green}{80} + \color{red}{2} \\ = & \color{red}{82} \end{align}\)