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1. \(20 + 14 = \ldots\)
2. \(38 + 30 = \ldots\)
3. \(40 + 56 = \ldots\)
4. \(28 + 50 = \ldots\)
5. \(28 + 30 = \ldots\)
6. \(29 + 50 = \ldots\)
7. \(69 + 30 = \ldots\)
8. \(10 + 77 = \ldots\)
9. \(40 + 34 = \ldots\)
10. \(42 + 30 = \ldots\)
11. \(10 + 57 = \ldots\)
12. \(46 + 30 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 20 + 14 \\= & 20 + \color{green}{10} + \color{red}{4} \\ = & \color{green}{30} + \color{red}{4} \\ = & \color{red}{34} \end{align}\)
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. \(\begin{align} & 40 + 56 \\= & 40 + \color{green}{50} + \color{red}{6} \\ = & \color{green}{90} + \color{red}{6} \\ = & \color{red}{96} \end{align}\)
4. \(\begin{align} & 28 + 50 \\ = & 50 + 28 \\= & 50 + \color{green}{20} + \color{red}{8} \\ = & \color{green}{70} + \color{red}{8} \\ = & \color{red}{78} \end{align}\)
5. \(\begin{align} & 28 + 30 \\ = & 30 + 28 \\= & 30 + \color{green}{20} + \color{red}{8} \\ = & \color{green}{50} + \color{red}{8} \\ = & \color{red}{58} \end{align}\)
6. \(\begin{align} & 29 + 50 \\ = & 50 + 29 \\= & 50 + \color{green}{20} + \color{red}{9} \\ = & \color{green}{70} + \color{red}{9} \\ = & \color{red}{79} \end{align}\)
7. \(\begin{align} & 69 + 30 \\ = & 30 + 69 \\= & 30 + \color{green}{60} + \color{red}{9} \\ = & \color{green}{90} + \color{red}{9} \\ = & \color{red}{99} \end{align}\)
8. \(\begin{align} & 10 + 77 \\= & 10 + \color{green}{70} + \color{red}{7} \\ = & \color{green}{80} + \color{red}{7} \\ = & \color{red}{87} \end{align}\)
9. \(\begin{align} & 40 + 34 \\= & 40 + \color{green}{30} + \color{red}{4} \\ = & \color{green}{70} + \color{red}{4} \\ = & \color{red}{74} \end{align}\)
10. \(\begin{align} & 42 + 30 \\ = & 30 + 42 \\= & 30 + \color{green}{40} + \color{red}{2} \\ = & \color{green}{70} + \color{red}{2} \\ = & \color{red}{72} \end{align}\)
11. \(\begin{align} & 10 + 57 \\= & 10 + \color{green}{50} + \color{red}{7} \\ = & \color{green}{60} + \color{red}{7} \\ = & \color{red}{67} \end{align}\)
12. \(\begin{align} & 46 + 30 \\ = & 30 + 46 \\= & 30 + \color{green}{40} + \color{red}{6} \\ = & \color{green}{70} + \color{red}{6} \\ = & \color{red}{76} \end{align}\)