Brug Mix (reeks 2)

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1. \(43 + 23 = \ldots\)
2. \(66 + 28 = \ldots\)
3. \(69 + 15 = \ldots\)
4. \(43 + 27 = \ldots\)
5. \(52 + 22 = \ldots\)
6. \(42 + 36 = \ldots\)
7. \(13 + 65 = \ldots\)
8. \(23 + 64 = \ldots\)
9. \(21 + 31 = \ldots\)
10. \(79 + 17 = \ldots\)
11. \(67 + 19 = \ldots\)
12. \(39 + 23 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 43 + 23\\= & \color{green}{40} + \color{red}{3} + \color{green}{20} + \color{red}{3} \\= & \color{green}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)
2. \(\begin{align} & 66 + 28\\= & \color{green}{60} + \color{red}{6} + \color{green}{20} + \color{red}{8} \\= & \color{green}{80} + \color{red}{14} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{4} \\= & \color{orange}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
3. \(\begin{align} & 69 + 15\\= & \color{green}{60} + \color{red}{9} + \color{green}{10} + \color{red}{5} \\= & \color{green}{70} + \color{red}{14} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{4} \\= & \color{orange}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
4. \(\begin{align} & 43 + 27\\= & \color{green}{40} + \color{red}{3} + \color{green}{20} + \color{red}{7} \\= & \color{green}{60} + \color{red}{10} \\= & \color{red}{70} \end{align}\)
5. \(\begin{align} & 52 + 22\\= & \color{green}{50} + \color{red}{2} + \color{green}{20} + \color{red}{2} \\= & \color{green}{70} + \color{red}{4} \\= & \color{red}{74} \end{align}\)
6. \(\begin{align} & 42 + 36\\= & \color{green}{40} + \color{red}{2} + \color{green}{30} + \color{red}{6} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
7. \(\begin{align} & 13 + 65\\= & \color{green}{10} + \color{red}{3} + \color{green}{60} + \color{red}{5} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
8. \(\begin{align} & 23 + 64\\= & \color{green}{20} + \color{red}{3} + \color{green}{60} + \color{red}{4} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
9. \(\begin{align} & 21 + 31\\= & \color{green}{20} + \color{red}{1} + \color{green}{30} + \color{red}{1} \\= & \color{green}{50} + \color{red}{2} \\= & \color{red}{52} \end{align}\)
10. \(\begin{align} & 79 + 17\\= & \color{green}{70} + \color{red}{9} + \color{green}{10} + \color{red}{7} \\= & \color{green}{80} + \color{red}{16} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{6} \\= & \color{orange}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
11. \(\begin{align} & 67 + 19\\= & \color{green}{60} + \color{red}{7} + \color{green}{10} + \color{red}{9} \\= & \color{green}{70} + \color{red}{16} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{6} \\= & \color{orange}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
12. \(\begin{align} & 39 + 23\\= & \color{green}{30} + \color{red}{9} + \color{green}{20} + \color{red}{3} \\= & \color{green}{50} + \color{red}{12} \\= & \color{green}{50} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{60} + \color{red}{2} \\= & \color{red}{62} \end{align}\)