Brug Mix (reeks 2)

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1. \(89 + 15 = \ldots\)
2. \(28 + 63 = \ldots\)
3. \(24 + 10 = \ldots\)
4. \(57 + 27 = \ldots\)
5. \(63 + 23 = \ldots\)
6. \(75 + 15 = \ldots\)
7. \(32 + 41 = \ldots\)
8. \(72 + 15 = \ldots\)
9. \(85 + 3 = \ldots\)
10. \(61 + 29 = \ldots\)
11. \(52 + 34 = \ldots\)
12. \(82 + 9 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 89 + 15\\= & \color{green}{80} + \color{red}{9} + \color{green}{10} + \color{red}{5} \\= & \color{green}{90} + \color{red}{14} \\= & \color{green}{90} + \color{orange}{10} + \color{red}{4} \\= & \color{orange}{100} + \color{red}{4} \\= & \color{red}{104} \end{align}\)
2. \(\begin{align} & 28 + 63\\= & \color{green}{20} + \color{red}{8} + \color{green}{60} + \color{red}{3} \\= & \color{green}{80} + \color{red}{11} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
3. \(\begin{align} & 24 + 10\\= &10+24\\= &10 + \color{green}{20} + \color{red}{4} \\= & \color{green}{30} + \color{red}{4} \\= & \color{red}{34} \end{align}\)
4. \(\begin{align} & 57 + 27\\= & \color{green}{50} + \color{red}{7} + \color{green}{20} + \color{red}{7} \\= & \color{green}{70} + \color{red}{14} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{4} \\= & \color{orange}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
5. \(\begin{align} & 63 + 23\\= & \color{green}{60} + \color{red}{3} + \color{green}{20} + \color{red}{3} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
6. \(\begin{align} & 75 + 15\\= & \color{green}{70} + \color{red}{5} + \color{green}{10} + \color{red}{5} \\= & \color{green}{80} + \color{red}{10} \\= & \color{red}{90} \end{align}\)
7. \(\begin{align} & 32 + 41\\= & \color{green}{30} + \color{red}{2} + \color{green}{40} + \color{red}{1} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
8. \(\begin{align} & 72 + 15\\= & \color{green}{70} + \color{red}{2} + \color{green}{10} + \color{red}{5} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
9. \(\begin{align} & 85 + 3\\= & \color{green}{80} + \color{red}{5} + \color{green}{0} + \color{red}{3} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
10. \(\begin{align} & 61 + 29\\= & \color{green}{60} + \color{red}{1} + \color{green}{20} + \color{red}{9} \\= & \color{green}{80} + \color{red}{10} \\= & \color{red}{90} \end{align}\)
11. \(\begin{align} & 52 + 34\\= & \color{green}{50} + \color{red}{2} + \color{green}{30} + \color{red}{4} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
12. \(\begin{align} & 82 + 9\\= & \color{green}{80} + \color{red}{2} + \color{green}{0} + \color{red}{9} \\= & \color{green}{80} + \color{red}{11} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)