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1. \(50 + 15 = \ldots\)
2. \(13 + 70 = \ldots\)
3. \(30 + 22 = \ldots\)
4. \(18 + 80 = \ldots\)
5. \(54 + 10 = \ldots\)
6. \(31 + 40 = \ldots\)
7. \(80 + 13 = \ldots\)
8. \(19 + 10 = \ldots\)
9. \(55 + 30 = \ldots\)
10. \(21 + 50 = \ldots\)
11. \(20 + 36 = \ldots\)
12. \(12 + 10 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 50 + 15 \\= & 50 + \color{green}{10} + \color{red}{5} \\ = & \color{green}{60} + \color{red}{5} \\ = & \color{red}{65} \end{align}\)
2. \(\begin{align} & 13 + 70 \\ = & 70 + 13 \\= & 70 + \color{green}{10} + \color{red}{3} \\ = & \color{green}{80} + \color{red}{3} \\ = & \color{red}{83} \end{align}\)
3. \(\begin{align} & 30 + 22 \\= & 30 + \color{green}{20} + \color{red}{2} \\ = & \color{green}{50} + \color{red}{2} \\ = & \color{red}{52} \end{align}\)
4. \(\begin{align} & 18 + 80 \\ = & 80 + 18 \\= & 80 + \color{green}{10} + \color{red}{8} \\ = & \color{green}{90} + \color{red}{8} \\ = & \color{red}{98} \end{align}\)
5. \(\begin{align} & 54 + 10 \\ = & 10 + 54 \\= & 10 + \color{green}{50} + \color{red}{4} \\ = & \color{green}{60} + \color{red}{4} \\ = & \color{red}{64} \end{align}\)
6. \(\begin{align} & 31 + 40 \\ = & 40 + 31 \\= & 40 + \color{green}{30} + \color{red}{1} \\ = & \color{green}{70} + \color{red}{1} \\ = & \color{red}{71} \end{align}\)
7. \(\begin{align} & 80 + 13 \\= & 80 + \color{green}{10} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}\)
8. \(\begin{align} & 19 + 10 \\ = & 10 + 19 \\= & 10 + \color{green}{10} + \color{red}{9} \\ = & \color{green}{20} + \color{red}{9} \\ = & \color{red}{29} \end{align}\)
9. \(\begin{align} & 55 + 30 \\ = & 30 + 55 \\= & 30 + \color{green}{50} + \color{red}{5} \\ = & \color{green}{80} + \color{red}{5} \\ = & \color{red}{85} \end{align}\)
10. \(\begin{align} & 21 + 50 \\ = & 50 + 21 \\= & 50 + \color{green}{20} + \color{red}{1} \\ = & \color{green}{70} + \color{red}{1} \\ = & \color{red}{71} \end{align}\)
11. \(\begin{align} & 20 + 36 \\= & 20 + \color{green}{30} + \color{red}{6} \\ = & \color{green}{50} + \color{red}{6} \\ = & \color{red}{56} \end{align}\)
12. \(\begin{align} & 12 + 10 \\ = & 10 + 12 \\= & 10 + \color{green}{10} + \color{red}{2} \\ = & \color{green}{20} + \color{red}{2} \\ = & \color{red}{22} \end{align}\)