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1. \(62 + 10 = \ldots\)
2. \(40 + 22 = \ldots\)
3. \(10 + 51 = \ldots\)
4. \(32 + 60 = \ldots\)
5. \(20 + 26 = \ldots\)
6. \(28 + 40 = \ldots\)
7. \(17 + 70 = \ldots\)
8. \(20 + 14 = \ldots\)
9. \(50 + 21 = \ldots\)
10. \(30 + 65 = \ldots\)
11. \(20 + 46 = \ldots\)
12. \(10 + 54 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 62 + 10 \\ = & 10 + 62 \\= & 10 + \color{green}{60} + \color{red}{2} \\ = & \color{green}{70} + \color{red}{2} \\ = & \color{red}{72} \end{align}\)
2. \(\begin{align} & 40 + 22 \\= & 40 + \color{green}{20} + \color{red}{2} \\ = & \color{green}{60} + \color{red}{2} \\ = & \color{red}{62} \end{align}\)
3. \(\begin{align} & 10 + 51 \\= & 10 + \color{green}{50} + \color{red}{1} \\ = & \color{green}{60} + \color{red}{1} \\ = & \color{red}{61} \end{align}\)
4. \(\begin{align} & 32 + 60 \\ = & 60 + 32 \\= & 60 + \color{green}{30} + \color{red}{2} \\ = & \color{green}{90} + \color{red}{2} \\ = & \color{red}{92} \end{align}\)
5. \(\begin{align} & 20 + 26 \\= & 20 + \color{green}{20} + \color{red}{6} \\ = & \color{green}{40} + \color{red}{6} \\ = & \color{red}{46} \end{align}\)
6. \(\begin{align} & 28 + 40 \\ = & 40 + 28 \\= & 40 + \color{green}{20} + \color{red}{8} \\ = & \color{green}{60} + \color{red}{8} \\ = & \color{red}{68} \end{align}\)
7. \(\begin{align} & 17 + 70 \\ = & 70 + 17 \\= & 70 + \color{green}{10} + \color{red}{7} \\ = & \color{green}{80} + \color{red}{7} \\ = & \color{red}{87} \end{align}\)
8. \(\begin{align} & 20 + 14 \\= & 20 + \color{green}{10} + \color{red}{4} \\ = & \color{green}{30} + \color{red}{4} \\ = & \color{red}{34} \end{align}\)
9. \(\begin{align} & 50 + 21 \\= & 50 + \color{green}{20} + \color{red}{1} \\ = & \color{green}{70} + \color{red}{1} \\ = & \color{red}{71} \end{align}\)
10. \(\begin{align} & 30 + 65 \\= & 30 + \color{green}{60} + \color{red}{5} \\ = & \color{green}{90} + \color{red}{5} \\ = & \color{red}{95} \end{align}\)
11. \(\begin{align} & 20 + 46 \\= & 20 + \color{green}{40} + \color{red}{6} \\ = & \color{green}{60} + \color{red}{6} \\ = & \color{red}{66} \end{align}\)
12. \(\begin{align} & 10 + 54 \\= & 10 + \color{green}{50} + \color{red}{4} \\ = & \color{green}{60} + \color{red}{4} \\ = & \color{red}{64} \end{align}\)