Brug Mix (reeks 2)

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1. \(89 + 4 = \ldots\)
2. \(57 + 28 = \ldots\)
3. \(16 + 17 = \ldots\)
4. \(68 + 26 = \ldots\)
5. \(74 + 10 = \ldots\)
6. \(52 + 18 = \ldots\)
7. \(41 + 20 = \ldots\)
8. \(14 + 78 = \ldots\)
9. \(70 + 14 = \ldots\)
10. \(18 + 24 = \ldots\)
11. \(29 + 11 = \ldots\)
12. \(56 + 33 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 89 + 4\\= & \color{green}{80} + \color{red}{9} + \color{green}{0} + \color{red}{4} \\= & \color{green}{80} + \color{red}{13} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
2. \(\begin{align} & 57 + 28\\= & \color{green}{50} + \color{red}{7} + \color{green}{20} + \color{red}{8} \\= & \color{green}{70} + \color{red}{15} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{5} \\= & \color{orange}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
3. \(\begin{align} & 16 + 17\\= & \color{green}{10} + \color{red}{6} + \color{green}{10} + \color{red}{7} \\= & \color{green}{20} + \color{red}{13} \\= & \color{green}{20} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{30} + \color{red}{3} \\= & \color{red}{33} \end{align}\)
4. \(\begin{align} & 68 + 26\\= & \color{green}{60} + \color{red}{8} + \color{green}{20} + \color{red}{6} \\= & \color{green}{80} + \color{red}{14} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{4} \\= & \color{orange}{90} + \color{red}{4} \\= & \color{red}{94} \end{align}\)
5. \(\begin{align} & 74 + 10\\= &10+74\\= &10 + \color{green}{70} + \color{red}{4} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
6. \(\begin{align} & 52 + 18\\= & \color{green}{50} + \color{red}{2} + \color{green}{10} + \color{red}{8} \\= & \color{green}{60} + \color{red}{10} \\= & \color{red}{70} \end{align}\)
7. \(\begin{align} & 41 + 20\\= &20+41\\= &20 + \color{green}{40} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
8. \(\begin{align} & 14 + 78\\= & \color{green}{10} + \color{red}{4} + \color{green}{70} + \color{red}{8} \\= & \color{green}{80} + \color{red}{12} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
9. \(\begin{align} & 70 + 14\\= &70 + \color{green}{10} + \color{red}{4} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
10. \(\begin{align} & 18 + 24\\= & \color{green}{10} + \color{red}{8} + \color{green}{20} + \color{red}{4} \\= & \color{green}{30} + \color{red}{12} \\= & \color{green}{30} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{40} + \color{red}{2} \\= & \color{red}{42} \end{align}\)
11. \(\begin{align} & 29 + 11\\= & \color{green}{20} + \color{red}{9} + \color{green}{10} + \color{red}{1} \\= & \color{green}{30} + \color{red}{10} \\= & \color{red}{40} \end{align}\)
12. \(\begin{align} & 56 + 33\\= & \color{green}{50} + \color{red}{6} + \color{green}{30} + \color{red}{3} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)