Brug Mix (reeks 2)

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1. \(25 + 13 = \ldots\)
2. \(22 + 53 = \ldots\)
3. \(36 + 39 = \ldots\)
4. \(69 + 16 = \ldots\)
5. \(27 + 20 = \ldots\)
6. \(68 + 21 = \ldots\)
7. \(24 + 47 = \ldots\)
8. \(64 + 26 = \ldots\)
9. \(20 + 32 = \ldots\)
10. \(74 + 19 = \ldots\)
11. \(45 + 49 = \ldots\)
12. \(83 + 16 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 25 + 13\\= & \color{green}{20} + \color{red}{5} + \color{green}{10} + \color{red}{3} \\= & \color{green}{30} + \color{red}{8} \\= & \color{red}{38} \end{align}\)
2. \(\begin{align} & 22 + 53\\= & \color{green}{20} + \color{red}{2} + \color{green}{50} + \color{red}{3} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
3. \(\begin{align} & 36 + 39\\= & \color{green}{30} + \color{red}{6} + \color{green}{30} + \color{red}{9} \\= & \color{green}{60} + \color{red}{15} \\= & \color{green}{60} + \color{orange}{10} + \color{red}{5} \\= & \color{orange}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
4. \(\begin{align} & 69 + 16\\= & \color{green}{60} + \color{red}{9} + \color{green}{10} + \color{red}{6} \\= & \color{green}{70} + \color{red}{15} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{5} \\= & \color{orange}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
5. \(\begin{align} & 27 + 20\\= &20+27\\= &20 + \color{green}{20} + \color{red}{7} \\= & \color{green}{40} + \color{red}{7} \\= & \color{red}{47} \end{align}\)
6. \(\begin{align} & 68 + 21\\= & \color{green}{60} + \color{red}{8} + \color{green}{20} + \color{red}{1} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
7. \(\begin{align} & 24 + 47\\= & \color{green}{20} + \color{red}{4} + \color{green}{40} + \color{red}{7} \\= & \color{green}{60} + \color{red}{11} \\= & \color{green}{60} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
8. \(\begin{align} & 64 + 26\\= & \color{green}{60} + \color{red}{4} + \color{green}{20} + \color{red}{6} \\= & \color{green}{80} + \color{red}{10} \\= & \color{red}{90} \end{align}\)
9. \(\begin{align} & 20 + 32\\= &20 + \color{green}{30} + \color{red}{2} \\= & \color{green}{50} + \color{red}{2} \\= & \color{red}{52} \end{align}\)
10. \(\begin{align} & 74 + 19\\= & \color{green}{70} + \color{red}{4} + \color{green}{10} + \color{red}{9} \\= & \color{green}{80} + \color{red}{13} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
11. \(\begin{align} & 45 + 49\\= & \color{green}{40} + \color{red}{5} + \color{green}{40} + \color{red}{9} \\= & \color{green}{80} + \color{red}{14} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{4} \\= & \color{orange}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
12. \(\begin{align} & 83 + 16\\= & \color{green}{80} + \color{red}{3} + \color{green}{10} + \color{red}{6} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)