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1. \(10 + 14 = \ldots\)
2. \(49 + 50 = \ldots\)
3. \(30 + 38 = \ldots\)
4. \(47 + 10 = \ldots\)
5. \(70 + 21 = \ldots\)
6. \(10 + 38 = \ldots\)
7. \(40 + 47 = \ldots\)
8. \(34 + 50 = \ldots\)
9. \(55 + 20 = \ldots\)
10. \(10 + 36 = \ldots\)
11. \(34 + 40 = \ldots\)
12. \(30 + 59 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 10 + 14 \\= & 10 + \color{green}{10} + \color{red}{4} \\ = & \color{green}{20} + \color{red}{4} \\ = & \color{red}{24} \end{align}\)
2. \(\begin{align} & 49 + 50 \\ = & 50 + 49 \\= & 50 + \color{green}{40} + \color{red}{9} \\ = & \color{green}{90} + \color{red}{9} \\ = & \color{red}{99} \end{align}\)
3. \(\begin{align} & 30 + 38 \\= & 30 + \color{green}{30} + \color{red}{8} \\ = & \color{green}{60} + \color{red}{8} \\ = & \color{red}{68} \end{align}\)
4. \(\begin{align} & 47 + 10 \\ = & 10 + 47 \\= & 10 + \color{green}{40} + \color{red}{7} \\ = & \color{green}{50} + \color{red}{7} \\ = & \color{red}{57} \end{align}\)
5. \(\begin{align} & 70 + 21 \\= & 70 + \color{green}{20} + \color{red}{1} \\ = & \color{green}{90} + \color{red}{1} \\ = & \color{red}{91} \end{align}\)
6. \(\begin{align} & 10 + 38 \\= & 10 + \color{green}{30} + \color{red}{8} \\ = & \color{green}{40} + \color{red}{8} \\ = & \color{red}{48} \end{align}\)
7. \(\begin{align} & 40 + 47 \\= & 40 + \color{green}{40} + \color{red}{7} \\ = & \color{green}{80} + \color{red}{7} \\ = & \color{red}{87} \end{align}\)
8. \(\begin{align} & 34 + 50 \\ = & 50 + 34 \\= & 50 + \color{green}{30} + \color{red}{4} \\ = & \color{green}{80} + \color{red}{4} \\ = & \color{red}{84} \end{align}\)
9. \(\begin{align} & 55 + 20 \\ = & 20 + 55 \\= & 20 + \color{green}{50} + \color{red}{5} \\ = & \color{green}{70} + \color{red}{5} \\ = & \color{red}{75} \end{align}\)
10. \(\begin{align} & 10 + 36 \\= & 10 + \color{green}{30} + \color{red}{6} \\ = & \color{green}{40} + \color{red}{6} \\ = & \color{red}{46} \end{align}\)
11. \(\begin{align} & 34 + 40 \\ = & 40 + 34 \\= & 40 + \color{green}{30} + \color{red}{4} \\ = & \color{green}{70} + \color{red}{4} \\ = & \color{red}{74} \end{align}\)
12. \(\begin{align} & 30 + 59 \\= & 30 + \color{green}{50} + \color{red}{9} \\ = & \color{green}{80} + \color{red}{9} \\ = & \color{red}{89} \end{align}\)