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1. \(59 + 20 = \ldots\)
2. \(20 + 57 = \ldots\)
3. \(77 + 10 = \ldots\)
4. \(10 + 31 = \ldots\)
5. \(30 + 52 = \ldots\)
6. \(24 + 70 = \ldots\)
7. \(20 + 36 = \ldots\)
8. \(23 + 10 = \ldots\)
9. \(10 + 95 = \ldots\)
10. \(31 + 30 = \ldots\)
11. \(80 + 17 = \ldots\)
12. \(80 + 19 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 59 + 20 \\ = & 20 + 59 \\= & 20 + \color{green}{50} + \color{red}{9} \\ = & \color{green}{70} + \color{red}{9} \\ = & \color{red}{79} \end{align}\)
2. \(\begin{align} & 20 + 57 \\= & 20 + \color{green}{50} + \color{red}{7} \\ = & \color{green}{70} + \color{red}{7} \\ = & \color{red}{77} \end{align}\)
3. \(\begin{align} & 77 + 10 \\ = & 10 + 77 \\= & 10 + \color{green}{70} + \color{red}{7} \\ = & \color{green}{80} + \color{red}{7} \\ = & \color{red}{87} \end{align}\)
4. \(\begin{align} & 10 + 31 \\= & 10 + \color{green}{30} + \color{red}{1} \\ = & \color{green}{40} + \color{red}{1} \\ = & \color{red}{41} \end{align}\)
5. \(\begin{align} & 30 + 52 \\= & 30 + \color{green}{50} + \color{red}{2} \\ = & \color{green}{80} + \color{red}{2} \\ = & \color{red}{82} \end{align}\)
6. \(\begin{align} & 24 + 70 \\ = & 70 + 24 \\= & 70 + \color{green}{20} + \color{red}{4} \\ = & \color{green}{90} + \color{red}{4} \\ = & \color{red}{94} \end{align}\)
7. \(\begin{align} & 20 + 36 \\= & 20 + \color{green}{30} + \color{red}{6} \\ = & \color{green}{50} + \color{red}{6} \\ = & \color{red}{56} \end{align}\)
8. \(\begin{align} & 23 + 10 \\ = & 10 + 23 \\= & 10 + \color{green}{20} + \color{red}{3} \\ = & \color{green}{30} + \color{red}{3} \\ = & \color{red}{33} \end{align}\)
9. \(\begin{align} & 10 + 95 \\= & 10 + \color{green}{90} + \color{red}{5} \\ = & \color{green}{100} + \color{red}{5} \\ = & \color{red}{105} \end{align}\)
10. \(\begin{align} & 31 + 30 \\ = & 30 + 31 \\= & 30 + \color{green}{30} + \color{red}{1} \\ = & \color{green}{60} + \color{red}{1} \\ = & \color{red}{61} \end{align}\)
11. \(\begin{align} & 80 + 17 \\= & 80 + \color{green}{10} + \color{red}{7} \\ = & \color{green}{90} + \color{red}{7} \\ = & \color{red}{97} \end{align}\)
12. \(\begin{align} & 80 + 19 \\= & 80 + \color{green}{10} + \color{red}{9} \\ = & \color{green}{90} + \color{red}{9} \\ = & \color{red}{99} \end{align}\)