Brug Mix (reeks 2)

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1. \(81 + 15 = \ldots\)
2. \(30 + 50 = \ldots\)
3. \(75 + 16 = \ldots\)
4. \(24 + 21 = \ldots\)
5. \(18 + 51 = \ldots\)
6. \(86 + 12 = \ldots\)
7. \(51 + 17 = \ldots\)
8. \(38 + 20 = \ldots\)
9. \(76 + 11 = \ldots\)
10. \(31 + 38 = \ldots\)
11. \(88 + 1 = \ldots\)
12. \(15 + 64 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 81 + 15\\= & \color{green}{80} + \color{red}{1} + \color{green}{10} + \color{red}{5} \\= & \color{green}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
2. \(\begin{align} & 30 + 50\\= &30 + \color{green}{50} + \color{red}{0} \\= & \color{green}{80} + \color{red}{0} \\= & \color{red}{80} \end{align}\)
3. \(\begin{align} & 75 + 16\\= & \color{green}{70} + \color{red}{5} + \color{green}{10} + \color{red}{6} \\= & \color{green}{80} + \color{red}{11} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
4. \(\begin{align} & 24 + 21\\= & \color{green}{20} + \color{red}{4} + \color{green}{20} + \color{red}{1} \\= & \color{green}{40} + \color{red}{5} \\= & \color{red}{45} \end{align}\)
5. \(\begin{align} & 18 + 51\\= & \color{green}{10} + \color{red}{8} + \color{green}{50} + \color{red}{1} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
6. \(\begin{align} & 86 + 12\\= & \color{green}{80} + \color{red}{6} + \color{green}{10} + \color{red}{2} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
7. \(\begin{align} & 51 + 17\\= & \color{green}{50} + \color{red}{1} + \color{green}{10} + \color{red}{7} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)
8. \(\begin{align} & 38 + 20\\= &20+38\\= &20 + \color{green}{30} + \color{red}{8} \\= & \color{green}{50} + \color{red}{8} \\= & \color{red}{58} \end{align}\)
9. \(\begin{align} & 76 + 11\\= & \color{green}{70} + \color{red}{6} + \color{green}{10} + \color{red}{1} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
10. \(\begin{align} & 31 + 38\\= & \color{green}{30} + \color{red}{1} + \color{green}{30} + \color{red}{8} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
11. \(\begin{align} & 88 + 1\\= & \color{green}{80} + \color{red}{8} + \color{green}{0} + \color{red}{1} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
12. \(\begin{align} & 15 + 64\\= & \color{green}{10} + \color{red}{5} + \color{green}{60} + \color{red}{4} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)