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1. \(13 + 70 = \ldots\)
2. \(40 + 38 = \ldots\)
3. \(30 + 33 = \ldots\)
4. \(53 + 10 = \ldots\)
5. \(14 + 70 = \ldots\)
6. \(10 + 16 = \ldots\)
7. \(60 + 23 = \ldots\)
8. \(0 + 96 = \ldots\)
9. \(30 + 19 = \ldots\)
10. \(52 + 30 = \ldots\)
11. \(61 + 30 = \ldots\)
12. \(40 + 31 = \ldots\)

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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. \(\begin{align} & 40 + 38 \\= & 40 + \color{green}{30} + \color{red}{8} \\ = & \color{green}{70} + \color{red}{8} \\ = & \color{red}{78} \end{align}\)
3. \(\begin{align} & 30 + 33 \\= & 30 + \color{green}{30} + \color{red}{3} \\ = & \color{green}{60} + \color{red}{3} \\ = & \color{red}{63} \end{align}\)
4. \(\begin{align} & 53 + 10 \\ = & 10 + 53 \\= & 10 + \color{green}{50} + \color{red}{3} \\ = & \color{green}{60} + \color{red}{3} \\ = & \color{red}{63} \end{align}\)
5. \(\begin{align} & 14 + 70 \\ = & 70 + 14 \\= & 70 + \color{green}{10} + \color{red}{4} \\ = & \color{green}{80} + \color{red}{4} \\ = & \color{red}{84} \end{align}\)
6. \(\begin{align} & 10 + 16 \\= & 10 + \color{green}{10} + \color{red}{6} \\ = & \color{green}{20} + \color{red}{6} \\ = & \color{red}{26} \end{align}\)
7. \(\begin{align} & 60 + 23 \\= & 60 + \color{green}{20} + \color{red}{3} \\ = & \color{green}{80} + \color{red}{3} \\ = & \color{red}{83} \end{align}\)
8. \(\begin{align} & 0 + 96 \\= & 0 + \color{green}{90} + \color{red}{6} \\ = & \color{green}{90} + \color{red}{6} \\ = & \color{red}{96} \end{align}\)
9. \(\begin{align} & 30 + 19 \\= & 30 + \color{green}{10} + \color{red}{9} \\ = & \color{green}{40} + \color{red}{9} \\ = & \color{red}{49} \end{align}\)
10. \(\begin{align} & 52 + 30 \\ = & 30 + 52 \\= & 30 + \color{green}{50} + \color{red}{2} \\ = & \color{green}{80} + \color{red}{2} \\ = & \color{red}{82} \end{align}\)
11. \(\begin{align} & 61 + 30 \\ = & 30 + 61 \\= & 30 + \color{green}{60} + \color{red}{1} \\ = & \color{green}{90} + \color{red}{1} \\ = & \color{red}{91} \end{align}\)
12. \(\begin{align} & 40 + 31 \\= & 40 + \color{green}{30} + \color{red}{1} \\ = & \color{green}{70} + \color{red}{1} \\ = & \color{red}{71} \end{align}\)