Brug Mix (reeks 2)

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1. \(18 + 76 = \ldots\)
2. \(60 + 15 = \ldots\)
3. \(80 + 4 = \ldots\)
4. \(73 + 12 = \ldots\)
5. \(39 + 30 = \ldots\)
6. \(88 + 9 = \ldots\)
7. \(70 + 17 = \ldots\)
8. \(10 + 51 = \ldots\)
9. \(47 + 19 = \ldots\)
10. \(31 + 40 = \ldots\)
11. \(52 + 17 = \ldots\)
12. \(63 + 14 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 18 + 76\\= & \color{green}{10} + \color{red}{8} + \color{green}{70} + \color{red}{6} \\= & \color{green}{80} + \color{red}{14} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{4} \\= & \color{orange}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
2. \(\begin{align} & 60 + 15\\= &60 + \color{green}{10} + \color{red}{5} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
3. \(\begin{align} & 80 + 4\\= &80 + \color{green}{0} + \color{red}{4} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
4. \(\begin{align} & 73 + 12\\= & \color{green}{70} + \color{red}{3} + \color{green}{10} + \color{red}{2} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
5. \(\begin{align} & 39 + 30\\= &30+39\\= &30 + \color{green}{30} + \color{red}{9} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
6. \(\begin{align} & 88 + 9\\= & \color{green}{80} + \color{red}{8} + \color{green}{0} + \color{red}{9} \\= & \color{green}{80} + \color{red}{17} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{7} \\= & \color{orange}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
7. \(\begin{align} & 70 + 17\\= &70 + \color{green}{10} + \color{red}{7} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
8. \(\begin{align} & 10 + 51\\= &10 + \color{green}{50} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
9. \(\begin{align} & 47 + 19\\= & \color{green}{40} + \color{red}{7} + \color{green}{10} + \color{red}{9} \\= & \color{green}{50} + \color{red}{16} \\= & \color{green}{50} + \color{orange}{10} + \color{red}{6} \\= & \color{orange}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)
10. \(\begin{align} & 31 + 40\\= &40+31\\= &40 + \color{green}{30} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
11. \(\begin{align} & 52 + 17\\= & \color{green}{50} + \color{red}{2} + \color{green}{10} + \color{red}{7} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
12. \(\begin{align} & 63 + 14\\= & \color{green}{60} + \color{red}{3} + \color{green}{10} + \color{red}{4} \\= & \color{green}{70} + \color{red}{7} \\= & \color{red}{77} \end{align}\)