Brug Mix (reeks 2)

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1. \(69 + 18 = \ldots\)
2. \(70 + 18 = \ldots\)
3. \(25 + 69 = \ldots\)
4. \(59 + 21 = \ldots\)
5. \(75 + 19 = \ldots\)
6. \(77 + 10 = \ldots\)
7. \(81 + 4 = \ldots\)
8. \(21 + 13 = \ldots\)
9. \(66 + 19 = \ldots\)
10. \(56 + 24 = \ldots\)
11. \(24 + 57 = \ldots\)
12. \(65 + 11 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 69 + 18\\= & \color{green}{60} + \color{red}{9} + \color{green}{10} + \color{red}{8} \\= & \color{green}{70} + \color{red}{17} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{7} \\= & \color{orange}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
2. \(\begin{align} & 70 + 18\\= &70 + \color{green}{10} + \color{red}{8} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
3. \(\begin{align} & 25 + 69\\= & \color{green}{20} + \color{red}{5} + \color{green}{60} + \color{red}{9} \\= & \color{green}{80} + \color{red}{14} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{4} \\= & \color{orange}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
4. \(\begin{align} & 59 + 21\\= & \color{green}{50} + \color{red}{9} + \color{green}{20} + \color{red}{1} \\= & \color{green}{70} + \color{red}{10} \\= & \color{red}{80} \end{align}\)
5. \(\begin{align} & 75 + 19\\= & \color{green}{70} + \color{red}{5} + \color{green}{10} + \color{red}{9} \\= & \color{green}{80} + \color{red}{14} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{4} \\= & \color{orange}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
6. \(\begin{align} & 77 + 10\\= &10+77\\= &10 + \color{green}{70} + \color{red}{7} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
7. \(\begin{align} & 81 + 4\\= & \color{green}{80} + \color{red}{1} + \color{green}{0} + \color{red}{4} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
8. \(\begin{align} & 21 + 13\\= & \color{green}{20} + \color{red}{1} + \color{green}{10} + \color{red}{3} \\= & \color{green}{30} + \color{red}{4} \\= & \color{red}{34} \end{align}\)
9. \(\begin{align} & 66 + 19\\= & \color{green}{60} + \color{red}{6} + \color{green}{10} + \color{red}{9} \\= & \color{green}{70} + \color{red}{15} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{5} \\= & \color{orange}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
10. \(\begin{align} & 56 + 24\\= & \color{green}{50} + \color{red}{6} + \color{green}{20} + \color{red}{4} \\= & \color{green}{70} + \color{red}{10} \\= & \color{red}{80} \end{align}\)
11. \(\begin{align} & 24 + 57\\= & \color{green}{20} + \color{red}{4} + \color{green}{50} + \color{red}{7} \\= & \color{green}{70} + \color{red}{11} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
12. \(\begin{align} & 65 + 11\\= & \color{green}{60} + \color{red}{5} + \color{green}{10} + \color{red}{1} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)