Brug Mix (reeks 2)

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1. \(47 + 42 = \ldots\)
2. \(18 + 65 = \ldots\)
3. \(11 + 57 = \ldots\)
4. \(66 + 23 = \ldots\)
5. \(85 + 17 = \ldots\)
6. \(63 + 20 = \ldots\)
7. \(61 + 11 = \ldots\)
8. \(40 + 42 = \ldots\)
9. \(76 + 18 = \ldots\)
10. \(30 + 43 = \ldots\)
11. \(47 + 49 = \ldots\)
12. \(41 + 20 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 47 + 42\\= & \color{green}{40} + \color{red}{7} + \color{green}{40} + \color{red}{2} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
2. \(\begin{align} & 18 + 65\\= & \color{green}{10} + \color{red}{8} + \color{green}{60} + \color{red}{5} \\= & \color{green}{70} + \color{red}{13} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
3. \(\begin{align} & 11 + 57\\= & \color{green}{10} + \color{red}{1} + \color{green}{50} + \color{red}{7} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)
4. \(\begin{align} & 66 + 23\\= & \color{green}{60} + \color{red}{6} + \color{green}{20} + \color{red}{3} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
5. \(\begin{align} & 85 + 17\\= & \color{green}{80} + \color{red}{5} + \color{green}{10} + \color{red}{7} \\= & \color{green}{90} + \color{red}{12} \\= & \color{green}{90} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{100} + \color{red}{2} \\= & \color{red}{102} \end{align}\)
6. \(\begin{align} & 63 + 20\\= &20+63\\= &20 + \color{green}{60} + \color{red}{3} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
7. \(\begin{align} & 61 + 11\\= & \color{green}{60} + \color{red}{1} + \color{green}{10} + \color{red}{1} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
8. \(\begin{align} & 40 + 42\\= &40 + \color{green}{40} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
9. \(\begin{align} & 76 + 18\\= & \color{green}{70} + \color{red}{6} + \color{green}{10} + \color{red}{8} \\= & \color{green}{80} + \color{red}{14} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{4} \\= & \color{orange}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
10. \(\begin{align} & 30 + 43\\= &30 + \color{green}{40} + \color{red}{3} \\= & \color{green}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
11. \(\begin{align} & 47 + 49\\= & \color{green}{40} + \color{red}{7} + \color{green}{40} + \color{red}{9} \\= & \color{green}{80} + \color{red}{16} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{6} \\= & \color{orange}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
12. \(\begin{align} & 41 + 20\\= &20+41\\= &20 + \color{green}{40} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)