Brug Mix (reeks 2)

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1. \(42 + 23 = \ldots\)
2. \(74 + 18 = \ldots\)
3. \(13 + 73 = \ldots\)
4. \(41 + 43 = \ldots\)
5. \(75 + 12 = \ldots\)
6. \(33 + 47 = \ldots\)
7. \(33 + 15 = \ldots\)
8. \(48 + 41 = \ldots\)
9. \(28 + 27 = \ldots\)
10. \(17 + 46 = \ldots\)
11. \(74 + 13 = \ldots\)
12. \(47 + 34 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 42 + 23\\= & \color{green}{40} + \color{red}{2} + \color{green}{20} + \color{red}{3} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
2. \(\begin{align} & 74 + 18\\= & \color{green}{70} + \color{red}{4} + \color{green}{10} + \color{red}{8} \\= & \color{green}{80} + \color{red}{12} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
3. \(\begin{align} & 13 + 73\\= & \color{green}{10} + \color{red}{3} + \color{green}{70} + \color{red}{3} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
4. \(\begin{align} & 41 + 43\\= & \color{green}{40} + \color{red}{1} + \color{green}{40} + \color{red}{3} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
5. \(\begin{align} & 75 + 12\\= & \color{green}{70} + \color{red}{5} + \color{green}{10} + \color{red}{2} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
6. \(\begin{align} & 33 + 47\\= & \color{green}{30} + \color{red}{3} + \color{green}{40} + \color{red}{7} \\= & \color{green}{70} + \color{red}{10} \\= & \color{red}{80} \end{align}\)
7. \(\begin{align} & 33 + 15\\= & \color{green}{30} + \color{red}{3} + \color{green}{10} + \color{red}{5} \\= & \color{green}{40} + \color{red}{8} \\= & \color{red}{48} \end{align}\)
8. \(\begin{align} & 48 + 41\\= & \color{green}{40} + \color{red}{8} + \color{green}{40} + \color{red}{1} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
9. \(\begin{align} & 28 + 27\\= & \color{green}{20} + \color{red}{8} + \color{green}{20} + \color{red}{7} \\= & \color{green}{40} + \color{red}{15} \\= & \color{green}{40} + \color{orange}{10} + \color{red}{5} \\= & \color{orange}{50} + \color{red}{5} \\= & \color{red}{55} \end{align}\)
10. \(\begin{align} & 17 + 46\\= & \color{green}{10} + \color{red}{7} + \color{green}{40} + \color{red}{6} \\= & \color{green}{50} + \color{red}{13} \\= & \color{green}{50} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{60} + \color{red}{3} \\= & \color{red}{63} \end{align}\)
11. \(\begin{align} & 74 + 13\\= & \color{green}{70} + \color{red}{4} + \color{green}{10} + \color{red}{3} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
12. \(\begin{align} & 47 + 34\\= & \color{green}{40} + \color{red}{7} + \color{green}{30} + \color{red}{4} \\= & \color{green}{70} + \color{red}{11} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)