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1. \(48 + 10 = \ldots\)
2. \(12 + 50 = \ldots\)
3. \(70 + 27 = \ldots\)
4. \(10 + 31 = \ldots\)
5. \(20 + 47 = \ldots\)
6. \(40 + 48 = \ldots\)
7. \(20 + 19 = \ldots\)
8. \(27 + 60 = \ldots\)
9. \(30 + 56 = \ldots\)
10. \(20 + 25 = \ldots\)
11. \(10 + 39 = \ldots\)
12. \(20 + 52 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 48 + 10 \\ = & 10 + 48 \\= & 10 + \color{green}{40} + \color{red}{8} \\ = & \color{green}{50} + \color{red}{8} \\ = & \color{red}{58} \end{align}\)
2. \(\begin{align} & 12 + 50 \\ = & 50 + 12 \\= & 50 + \color{green}{10} + \color{red}{2} \\ = & \color{green}{60} + \color{red}{2} \\ = & \color{red}{62} \end{align}\)
3. \(\begin{align} & 70 + 27 \\= & 70 + \color{green}{20} + \color{red}{7} \\ = & \color{green}{90} + \color{red}{7} \\ = & \color{red}{97} \end{align}\)
4. \(\begin{align} & 10 + 31 \\= & 10 + \color{green}{30} + \color{red}{1} \\ = & \color{green}{40} + \color{red}{1} \\ = & \color{red}{41} \end{align}\)
5. \(\begin{align} & 20 + 47 \\= & 20 + \color{green}{40} + \color{red}{7} \\ = & \color{green}{60} + \color{red}{7} \\ = & \color{red}{67} \end{align}\)
6. \(\begin{align} & 40 + 48 \\= & 40 + \color{green}{40} + \color{red}{8} \\ = & \color{green}{80} + \color{red}{8} \\ = & \color{red}{88} \end{align}\)
7. \(\begin{align} & 20 + 19 \\= & 20 + \color{green}{10} + \color{red}{9} \\ = & \color{green}{30} + \color{red}{9} \\ = & \color{red}{39} \end{align}\)
8. \(\begin{align} & 27 + 60 \\ = & 60 + 27 \\= & 60 + \color{green}{20} + \color{red}{7} \\ = & \color{green}{80} + \color{red}{7} \\ = & \color{red}{87} \end{align}\)
9. \(\begin{align} & 30 + 56 \\= & 30 + \color{green}{50} + \color{red}{6} \\ = & \color{green}{80} + \color{red}{6} \\ = & \color{red}{86} \end{align}\)
10. \(\begin{align} & 20 + 25 \\= & 20 + \color{green}{20} + \color{red}{5} \\ = & \color{green}{40} + \color{red}{5} \\ = & \color{red}{45} \end{align}\)
11. \(\begin{align} & 10 + 39 \\= & 10 + \color{green}{30} + \color{red}{9} \\ = & \color{green}{40} + \color{red}{9} \\ = & \color{red}{49} \end{align}\)
12. \(\begin{align} & 20 + 52 \\= & 20 + \color{green}{50} + \color{red}{2} \\ = & \color{green}{70} + \color{red}{2} \\ = & \color{red}{72} \end{align}\)