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1. \(70 + 29 = \ldots\)
2. \(98 + 10 = \ldots\)
3. \(63 + 10 = \ldots\)
4. \(47 + 30 = \ldots\)
5. \(46 + 10 = \ldots\)
6. \(38 + 60 = \ldots\)
7. \(30 + 49 = \ldots\)
8. \(10 + 53 = \ldots\)
9. \(50 + 18 = \ldots\)
10. \(50 + 31 = \ldots\)
11. \(62 + 10 = \ldots\)
12. \(36 + 50 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 70 + 29 \\= & 70 + \color{green}{20} + \color{red}{9} \\ = & \color{green}{90} + \color{red}{9} \\ = & \color{red}{99} \end{align}\)
2. \(\begin{align} & 98 + 10 \\ = & 10 + 98 \\= & 10 + \color{green}{90} + \color{red}{8} \\ = & \color{green}{100} + \color{red}{8} \\ = & \color{red}{108} \end{align}\)
3. \(\begin{align} & 63 + 10 \\ = & 10 + 63 \\= & 10 + \color{green}{60} + \color{red}{3} \\ = & \color{green}{70} + \color{red}{3} \\ = & \color{red}{73} \end{align}\)
4. \(\begin{align} & 47 + 30 \\ = & 30 + 47 \\= & 30 + \color{green}{40} + \color{red}{7} \\ = & \color{green}{70} + \color{red}{7} \\ = & \color{red}{77} \end{align}\)
5. \(\begin{align} & 46 + 10 \\ = & 10 + 46 \\= & 10 + \color{green}{40} + \color{red}{6} \\ = & \color{green}{50} + \color{red}{6} \\ = & \color{red}{56} \end{align}\)
6. \(\begin{align} & 38 + 60 \\ = & 60 + 38 \\= & 60 + \color{green}{30} + \color{red}{8} \\ = & \color{green}{90} + \color{red}{8} \\ = & \color{red}{98} \end{align}\)
7. \(\begin{align} & 30 + 49 \\= & 30 + \color{green}{40} + \color{red}{9} \\ = & \color{green}{70} + \color{red}{9} \\ = & \color{red}{79} \end{align}\)
8. \(\begin{align} & 10 + 53 \\= & 10 + \color{green}{50} + \color{red}{3} \\ = & \color{green}{60} + \color{red}{3} \\ = & \color{red}{63} \end{align}\)
9. \(\begin{align} & 50 + 18 \\= & 50 + \color{green}{10} + \color{red}{8} \\ = & \color{green}{60} + \color{red}{8} \\ = & \color{red}{68} \end{align}\)
10. \(\begin{align} & 50 + 31 \\= & 50 + \color{green}{30} + \color{red}{1} \\ = & \color{green}{80} + \color{red}{1} \\ = & \color{red}{81} \end{align}\)
11. \(\begin{align} & 62 + 10 \\ = & 10 + 62 \\= & 10 + \color{green}{60} + \color{red}{2} \\ = & \color{green}{70} + \color{red}{2} \\ = & \color{red}{72} \end{align}\)
12. \(\begin{align} & 36 + 50 \\ = & 50 + 36 \\= & 50 + \color{green}{30} + \color{red}{6} \\ = & \color{green}{80} + \color{red}{6} \\ = & \color{red}{86} \end{align}\)