Brug Mix (reeks 2)

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1. \(72 + 15 = \ldots\)
2. \(55 + 31 = \ldots\)
3. \(49 + 43 = \ldots\)
4. \(52 + 13 = \ldots\)
5. \(52 + 29 = \ldots\)
6. \(61 + 22 = \ldots\)
7. \(46 + 46 = \ldots\)
8. \(27 + 11 = \ldots\)
9. \(80 + 8 = \ldots\)
10. \(52 + 10 = \ldots\)
11. \(36 + 31 = \ldots\)
12. \(17 + 75 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 72 + 15\\= & \color{green}{70} + \color{red}{2} + \color{green}{10} + \color{red}{5} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
2. \(\begin{align} & 55 + 31\\= & \color{green}{50} + \color{red}{5} + \color{green}{30} + \color{red}{1} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
3. \(\begin{align} & 49 + 43\\= & \color{green}{40} + \color{red}{9} + \color{green}{40} + \color{red}{3} \\= & \color{green}{80} + \color{red}{12} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
4. \(\begin{align} & 52 + 13\\= & \color{green}{50} + \color{red}{2} + \color{green}{10} + \color{red}{3} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
5. \(\begin{align} & 52 + 29\\= & \color{green}{50} + \color{red}{2} + \color{green}{20} + \color{red}{9} \\= & \color{green}{70} + \color{red}{11} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
6. \(\begin{align} & 61 + 22\\= & \color{green}{60} + \color{red}{1} + \color{green}{20} + \color{red}{2} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
7. \(\begin{align} & 46 + 46\\= & \color{green}{40} + \color{red}{6} + \color{green}{40} + \color{red}{6} \\= & \color{green}{80} + \color{red}{12} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
8. \(\begin{align} & 27 + 11\\= & \color{green}{20} + \color{red}{7} + \color{green}{10} + \color{red}{1} \\= & \color{green}{30} + \color{red}{8} \\= & \color{red}{38} \end{align}\)
9. \(\begin{align} & 80 + 8\\= &80 + \color{green}{0} + \color{red}{8} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
10. \(\begin{align} & 52 + 10\\= &10+52\\= &10 + \color{green}{50} + \color{red}{2} \\= & \color{green}{60} + \color{red}{2} \\= & \color{red}{62} \end{align}\)
11. \(\begin{align} & 36 + 31\\= & \color{green}{30} + \color{red}{6} + \color{green}{30} + \color{red}{1} \\= & \color{green}{60} + \color{red}{7} \\= & \color{red}{67} \end{align}\)
12. \(\begin{align} & 17 + 75\\= & \color{green}{10} + \color{red}{7} + \color{green}{70} + \color{red}{5} \\= & \color{green}{80} + \color{red}{12} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)