Brug Mix (reeks 2)

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1. \(52 + 27 = \ldots\)
2. \(69 + 22 = \ldots\)
3. \(88 + 10 = \ldots\)
4. \(43 + 42 = \ldots\)
5. \(73 + 10 = \ldots\)
6. \(27 + 43 = \ldots\)
7. \(20 + 65 = \ldots\)
8. \(40 + 47 = \ldots\)
9. \(56 + 19 = \ldots\)
10. \(86 + 12 = \ldots\)
11. \(63 + 17 = \ldots\)
12. \(72 + 12 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 52 + 27\\= & \color{green}{50} + \color{red}{2} + \color{green}{20} + \color{red}{7} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
2. \(\begin{align} & 69 + 22\\= & \color{green}{60} + \color{red}{9} + \color{green}{20} + \color{red}{2} \\= & \color{green}{80} + \color{red}{11} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
3. \(\begin{align} & 88 + 10\\= &10+88\\= &10 + \color{green}{80} + \color{red}{8} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
4. \(\begin{align} & 43 + 42\\= & \color{green}{40} + \color{red}{3} + \color{green}{40} + \color{red}{2} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
5. \(\begin{align} & 73 + 10\\= &10+73\\= &10 + \color{green}{70} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
6. \(\begin{align} & 27 + 43\\= & \color{green}{20} + \color{red}{7} + \color{green}{40} + \color{red}{3} \\= & \color{green}{60} + \color{red}{10} \\= & \color{red}{70} \end{align}\)
7. \(\begin{align} & 20 + 65\\= &20 + \color{green}{60} + \color{red}{5} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
8. \(\begin{align} & 40 + 47\\= &40 + \color{green}{40} + \color{red}{7} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
9. \(\begin{align} & 56 + 19\\= & \color{green}{50} + \color{red}{6} + \color{green}{10} + \color{red}{9} \\= & \color{green}{60} + \color{red}{15} \\= & \color{green}{60} + \color{orange}{10} + \color{red}{5} \\= & \color{orange}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
10. \(\begin{align} & 86 + 12\\= & \color{green}{80} + \color{red}{6} + \color{green}{10} + \color{red}{2} \\= & \color{green}{90} + \color{red}{8} \\= & \color{red}{98} \end{align}\)
11. \(\begin{align} & 63 + 17\\= & \color{green}{60} + \color{red}{3} + \color{green}{10} + \color{red}{7} \\= & \color{green}{70} + \color{red}{10} \\= & \color{red}{80} \end{align}\)
12. \(\begin{align} & 72 + 12\\= & \color{green}{70} + \color{red}{2} + \color{green}{10} + \color{red}{2} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)