Brug Mix (reeks 2)

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1. \(45 + 28 = \ldots\)
2. \(74 + 17 = \ldots\)
3. \(76 + 16 = \ldots\)
4. \(80 + 1 = \ldots\)
5. \(32 + 20 = \ldots\)
6. \(60 + 20 = \ldots\)
7. \(65 + 14 = \ldots\)
8. \(12 + 70 = \ldots\)
9. \(70 + 16 = \ldots\)
10. \(34 + 12 = \ldots\)
11. \(35 + 39 = \ldots\)
12. \(40 + 36 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 45 + 28\\= & \color{green}{40} + \color{red}{5} + \color{green}{20} + \color{red}{8} \\= & \color{green}{60} + \color{red}{13} \\= & \color{green}{60} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
2. \(\begin{align} & 74 + 17\\= & \color{green}{70} + \color{red}{4} + \color{green}{10} + \color{red}{7} \\= & \color{green}{80} + \color{red}{11} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
3. \(\begin{align} & 76 + 16\\= & \color{green}{70} + \color{red}{6} + \color{green}{10} + \color{red}{6} \\= & \color{green}{80} + \color{red}{12} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
4. \(\begin{align} & 80 + 1\\= &80 + \color{green}{0} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
5. \(\begin{align} & 32 + 20\\= &20+32\\= &20 + \color{green}{30} + \color{red}{2} \\= & \color{green}{50} + \color{red}{2} \\= & \color{red}{52} \end{align}\)
6. \(\begin{align} & 60 + 20\\= &60 + \color{green}{20} + \color{red}{0} \\= & \color{green}{80} + \color{red}{0} \\= & \color{red}{80} \end{align}\)
7. \(\begin{align} & 65 + 14\\= & \color{green}{60} + \color{red}{5} + \color{green}{10} + \color{red}{4} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
8. \(\begin{align} & 12 + 70\\= &70+12\\= &70 + \color{green}{10} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
9. \(\begin{align} & 70 + 16\\= &70 + \color{green}{10} + \color{red}{6} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
10. \(\begin{align} & 34 + 12\\= & \color{green}{30} + \color{red}{4} + \color{green}{10} + \color{red}{2} \\= & \color{green}{40} + \color{red}{6} \\= & \color{red}{46} \end{align}\)
11. \(\begin{align} & 35 + 39\\= & \color{green}{30} + \color{red}{5} + \color{green}{30} + \color{red}{9} \\= & \color{green}{60} + \color{red}{14} \\= & \color{green}{60} + \color{orange}{10} + \color{red}{4} \\= & \color{orange}{70} + \color{red}{4} \\= & \color{red}{74} \end{align}\)
12. \(\begin{align} & 40 + 36\\= &40 + \color{green}{30} + \color{red}{6} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)