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1. \(13 + 70 = \ldots\)
2. \(26 + 50 = \ldots\)
3. \(97 + 0 = \ldots\)
4. \(30 + 65 = \ldots\)
5. \(37 + 50 = \ldots\)
6. \(65 + 10 = \ldots\)
7. \(40 + 18 = \ldots\)
8. \(60 + 12 = \ldots\)
9. \(70 + 12 = \ldots\)
10. \(32 + 10 = \ldots\)
11. \(50 + 48 = \ldots\)
12. \(94 + 10 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 13 + 70 \\ = & 70 + 13 \\= & 70 + \color{green}{10} + \color{red}{3} \\ = & \color{green}{80} + \color{red}{3} \\ = & \color{red}{83} \end{align}\)
2. \(\begin{align} & 26 + 50 \\ = & 50 + 26 \\= & 50 + \color{green}{20} + \color{red}{6} \\ = & \color{green}{70} + \color{red}{6} \\ = & \color{red}{76} \end{align}\)
3. \(\begin{align} & 97 + 0 \\ = & 0 + 97 \\= & 0 + \color{green}{90} + \color{red}{7} \\ = & \color{green}{90} + \color{red}{7} \\ = & \color{red}{97} \end{align}\)
4. \(\begin{align} & 30 + 65 \\= & 30 + \color{green}{60} + \color{red}{5} \\ = & \color{green}{90} + \color{red}{5} \\ = & \color{red}{95} \end{align}\)
5. \(\begin{align} & 37 + 50 \\ = & 50 + 37 \\= & 50 + \color{green}{30} + \color{red}{7} \\ = & \color{green}{80} + \color{red}{7} \\ = & \color{red}{87} \end{align}\)
6. \(\begin{align} & 65 + 10 \\ = & 10 + 65 \\= & 10 + \color{green}{60} + \color{red}{5} \\ = & \color{green}{70} + \color{red}{5} \\ = & \color{red}{75} \end{align}\)
7. \(\begin{align} & 40 + 18 \\= & 40 + \color{green}{10} + \color{red}{8} \\ = & \color{green}{50} + \color{red}{8} \\ = & \color{red}{58} \end{align}\)
8. \(\begin{align} & 60 + 12 \\= & 60 + \color{green}{10} + \color{red}{2} \\ = & \color{green}{70} + \color{red}{2} \\ = & \color{red}{72} \end{align}\)
9. \(\begin{align} & 70 + 12 \\= & 70 + \color{green}{10} + \color{red}{2} \\ = & \color{green}{80} + \color{red}{2} \\ = & \color{red}{82} \end{align}\)
10. \(\begin{align} & 32 + 10 \\ = & 10 + 32 \\= & 10 + \color{green}{30} + \color{red}{2} \\ = & \color{green}{40} + \color{red}{2} \\ = & \color{red}{42} \end{align}\)
11. \(\begin{align} & 50 + 48 \\= & 50 + \color{green}{40} + \color{red}{8} \\ = & \color{green}{90} + \color{red}{8} \\ = & \color{red}{98} \end{align}\)
12. \(\begin{align} & 94 + 10 \\ = & 10 + 94 \\= & 10 + \color{green}{90} + \color{red}{4} \\ = & \color{green}{100} + \color{red}{4} \\ = & \color{red}{104} \end{align}\)