Brug Mix (reeks 2)

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1. \(71 + 14 = \ldots\)
2. \(80 + 9 = \ldots\)
3. \(54 + 21 = \ldots\)
4. \(72 + 19 = \ldots\)
5. \(15 + 65 = \ldots\)
6. \(79 + 16 = \ldots\)
7. \(26 + 49 = \ldots\)
8. \(88 + 2 = \ldots\)
9. \(43 + 36 = \ldots\)
10. \(52 + 19 = \ldots\)
11. \(40 + 15 = \ldots\)
12. \(74 + 19 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 71 + 14\\= & \color{green}{70} + \color{red}{1} + \color{green}{10} + \color{red}{4} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
2. \(\begin{align} & 80 + 9\\= &80 + \color{green}{0} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
3. \(\begin{align} & 54 + 21\\= & \color{green}{50} + \color{red}{4} + \color{green}{20} + \color{red}{1} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
4. \(\begin{align} & 72 + 19\\= & \color{green}{70} + \color{red}{2} + \color{green}{10} + \color{red}{9} \\= & \color{green}{80} + \color{red}{11} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
5. \(\begin{align} & 15 + 65\\= & \color{green}{10} + \color{red}{5} + \color{green}{60} + \color{red}{5} \\= & \color{green}{70} + \color{red}{10} \\= & \color{red}{80} \end{align}\)
6. \(\begin{align} & 79 + 16\\= & \color{green}{70} + \color{red}{9} + \color{green}{10} + \color{red}{6} \\= & \color{green}{80} + \color{red}{15} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{5} \\= & \color{orange}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
7. \(\begin{align} & 26 + 49\\= & \color{green}{20} + \color{red}{6} + \color{green}{40} + \color{red}{9} \\= & \color{green}{60} + \color{red}{15} \\= & \color{green}{60} + \color{orange}{10} + \color{red}{5} \\= & \color{orange}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
8. \(\begin{align} & 88 + 2\\= & \color{green}{80} + \color{red}{8} + \color{green}{0} + \color{red}{2} \\= & \color{green}{80} + \color{red}{10} \\= & \color{red}{90} \end{align}\)
9. \(\begin{align} & 43 + 36\\= & \color{green}{40} + \color{red}{3} + \color{green}{30} + \color{red}{6} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
10. \(\begin{align} & 52 + 19\\= & \color{green}{50} + \color{red}{2} + \color{green}{10} + \color{red}{9} \\= & \color{green}{60} + \color{red}{11} \\= & \color{green}{60} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
11. \(\begin{align} & 40 + 15\\= &40 + \color{green}{10} + \color{red}{5} \\= & \color{green}{50} + \color{red}{5} \\= & \color{red}{55} \end{align}\)
12. \(\begin{align} & 74 + 19\\= & \color{green}{70} + \color{red}{4} + \color{green}{10} + \color{red}{9} \\= & \color{green}{80} + \color{red}{13} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)