Brug Mix (reeks 2)

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1. \(14 + 69 = \ldots\)
2. \(48 + 47 = \ldots\)
3. \(27 + 32 = \ldots\)
4. \(42 + 30 = \ldots\)
5. \(66 + 27 = \ldots\)
6. \(73 + 17 = \ldots\)
7. \(19 + 33 = \ldots\)
8. \(65 + 16 = \ldots\)
9. \(58 + 36 = \ldots\)
10. \(13 + 43 = \ldots\)
11. \(28 + 30 = \ldots\)
12. \(62 + 17 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 14 + 69\\= & \color{green}{10} + \color{red}{4} + \color{green}{60} + \color{red}{9} \\= & \color{green}{70} + \color{red}{13} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
2. \(\begin{align} & 48 + 47\\= & \color{green}{40} + \color{red}{8} + \color{green}{40} + \color{red}{7} \\= & \color{green}{80} + \color{red}{15} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{5} \\= & \color{orange}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
3. \(\begin{align} & 27 + 32\\= & \color{green}{20} + \color{red}{7} + \color{green}{30} + \color{red}{2} \\= & \color{green}{50} + \color{red}{9} \\= & \color{red}{59} \end{align}\)
4. \(\begin{align} & 42 + 30\\= &30+42\\= &30 + \color{green}{40} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
5. \(\begin{align} & 66 + 27\\= & \color{green}{60} + \color{red}{6} + \color{green}{20} + \color{red}{7} \\= & \color{green}{80} + \color{red}{13} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
6. \(\begin{align} & 73 + 17\\= & \color{green}{70} + \color{red}{3} + \color{green}{10} + \color{red}{7} \\= & \color{green}{80} + \color{red}{10} \\= & \color{red}{90} \end{align}\)
7. \(\begin{align} & 19 + 33\\= & \color{green}{10} + \color{red}{9} + \color{green}{30} + \color{red}{3} \\= & \color{green}{40} + \color{red}{12} \\= & \color{green}{40} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{50} + \color{red}{2} \\= & \color{red}{52} \end{align}\)
8. \(\begin{align} & 65 + 16\\= & \color{green}{60} + \color{red}{5} + \color{green}{10} + \color{red}{6} \\= & \color{green}{70} + \color{red}{11} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
9. \(\begin{align} & 58 + 36\\= & \color{green}{50} + \color{red}{8} + \color{green}{30} + \color{red}{6} \\= & \color{green}{80} + \color{red}{14} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{4} \\= & \color{orange}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
10. \(\begin{align} & 13 + 43\\= & \color{green}{10} + \color{red}{3} + \color{green}{40} + \color{red}{3} \\= & \color{green}{50} + \color{red}{6} \\= & \color{red}{56} \end{align}\)
11. \(\begin{align} & 28 + 30\\= &30+28\\= &30 + \color{green}{20} + \color{red}{8} \\= & \color{green}{50} + \color{red}{8} \\= & \color{red}{58} \end{align}\)
12. \(\begin{align} & 62 + 17\\= & \color{green}{60} + \color{red}{2} + \color{green}{10} + \color{red}{7} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)