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1. \(47 + 20 = \ldots\)
2. \(20 + 27 = \ldots\)
3. \(35 + 10 = \ldots\)
4. \(30 + 58 = \ldots\)
5. \(20 + 59 = \ldots\)
6. \(27 + 60 = \ldots\)
7. \(99 + 0 = \ldots\)
8. \(60 + 39 = \ldots\)
9. \(46 + 40 = \ldots\)
10. \(30 + 63 = \ldots\)
11. \(39 + 20 = \ldots\)
12. \(10 + 62 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 47 + 20 \\ = & 20 + 47 \\= & 20 + \color{green}{40} + \color{red}{7} \\ = & \color{green}{60} + \color{red}{7} \\ = & \color{red}{67} \end{align}\)
2. \(\begin{align} & 20 + 27 \\= & 20 + \color{green}{20} + \color{red}{7} \\ = & \color{green}{40} + \color{red}{7} \\ = & \color{red}{47} \end{align}\)
3. \(\begin{align} & 35 + 10 \\ = & 10 + 35 \\= & 10 + \color{green}{30} + \color{red}{5} \\ = & \color{green}{40} + \color{red}{5} \\ = & \color{red}{45} \end{align}\)
4. \(\begin{align} & 30 + 58 \\= & 30 + \color{green}{50} + \color{red}{8} \\ = & \color{green}{80} + \color{red}{8} \\ = & \color{red}{88} \end{align}\)
5. \(\begin{align} & 20 + 59 \\= & 20 + \color{green}{50} + \color{red}{9} \\ = & \color{green}{70} + \color{red}{9} \\ = & \color{red}{79} \end{align}\)
6. \(\begin{align} & 27 + 60 \\ = & 60 + 27 \\= & 60 + \color{green}{20} + \color{red}{7} \\ = & \color{green}{80} + \color{red}{7} \\ = & \color{red}{87} \end{align}\)
7. \(\begin{align} & 99 + 0 \\ = & 0 + 99 \\= & 0 + \color{green}{90} + \color{red}{9} \\ = & \color{green}{90} + \color{red}{9} \\ = & \color{red}{99} \end{align}\)
8. \(\begin{align} & 60 + 39 \\= & 60 + \color{green}{30} + \color{red}{9} \\ = & \color{green}{90} + \color{red}{9} \\ = & \color{red}{99} \end{align}\)
9. \(\begin{align} & 46 + 40 \\ = & 40 + 46 \\= & 40 + \color{green}{40} + \color{red}{6} \\ = & \color{green}{80} + \color{red}{6} \\ = & \color{red}{86} \end{align}\)
10. \(\begin{align} & 30 + 63 \\= & 30 + \color{green}{60} + \color{red}{3} \\ = & \color{green}{90} + \color{red}{3} \\ = & \color{red}{93} \end{align}\)
11. \(\begin{align} & 39 + 20 \\ = & 20 + 39 \\= & 20 + \color{green}{30} + \color{red}{9} \\ = & \color{green}{50} + \color{red}{9} \\ = & \color{red}{59} \end{align}\)
12. \(\begin{align} & 10 + 62 \\= & 10 + \color{green}{60} + \color{red}{2} \\ = & \color{green}{70} + \color{red}{2} \\ = & \color{red}{72} \end{align}\)