Brug Mix (reeks 2)

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1. \(42 + 48 = \ldots\)
2. \(67 + 13 = \ldots\)
3. \(74 + 19 = \ldots\)
4. \(28 + 67 = \ldots\)
5. \(58 + 27 = \ldots\)
6. \(86 + 1 = \ldots\)
7. \(22 + 51 = \ldots\)
8. \(85 + 6 = \ldots\)
9. \(21 + 33 = \ldots\)
10. \(58 + 25 = \ldots\)
11. \(65 + 23 = \ldots\)
12. \(58 + 24 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 42 + 48\\= & \color{green}{40} + \color{red}{2} + \color{green}{40} + \color{red}{8} \\= & \color{green}{80} + \color{red}{10} \\= & \color{red}{90} \end{align}\)
2. \(\begin{align} & 67 + 13\\= & \color{green}{60} + \color{red}{7} + \color{green}{10} + \color{red}{3} \\= & \color{green}{70} + \color{red}{10} \\= & \color{red}{80} \end{align}\)
3. \(\begin{align} & 74 + 19\\= & \color{green}{70} + \color{red}{4} + \color{green}{10} + \color{red}{9} \\= & \color{green}{80} + \color{red}{13} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
4. \(\begin{align} & 28 + 67\\= & \color{green}{20} + \color{red}{8} + \color{green}{60} + \color{red}{7} \\= & \color{green}{80} + \color{red}{15} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{5} \\= & \color{orange}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
5. \(\begin{align} & 58 + 27\\= & \color{green}{50} + \color{red}{8} + \color{green}{20} + \color{red}{7} \\= & \color{green}{70} + \color{red}{15} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{5} \\= & \color{orange}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
6. \(\begin{align} & 86 + 1\\= & \color{green}{80} + \color{red}{6} + \color{green}{0} + \color{red}{1} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
7. \(\begin{align} & 22 + 51\\= & \color{green}{20} + \color{red}{2} + \color{green}{50} + \color{red}{1} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
8. \(\begin{align} & 85 + 6\\= & \color{green}{80} + \color{red}{5} + \color{green}{0} + \color{red}{6} \\= & \color{green}{80} + \color{red}{11} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
9. \(\begin{align} & 21 + 33\\= & \color{green}{20} + \color{red}{1} + \color{green}{30} + \color{red}{3} \\= & \color{green}{50} + \color{red}{4} \\= & \color{red}{54} \end{align}\)
10. \(\begin{align} & 58 + 25\\= & \color{green}{50} + \color{red}{8} + \color{green}{20} + \color{red}{5} \\= & \color{green}{70} + \color{red}{13} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
11. \(\begin{align} & 65 + 23\\= & \color{green}{60} + \color{red}{5} + \color{green}{20} + \color{red}{3} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
12. \(\begin{align} & 58 + 24\\= & \color{green}{50} + \color{red}{8} + \color{green}{20} + \color{red}{4} \\= & \color{green}{70} + \color{red}{12} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)