Brug Mix (reeks 2)

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1. \(11 + 50 = \ldots\)
2. \(71 + 12 = \ldots\)
3. \(40 + 30 = \ldots\)
4. \(72 + 15 = \ldots\)
5. \(30 + 14 = \ldots\)
6. \(77 + 16 = \ldots\)
7. \(51 + 27 = \ldots\)
8. \(57 + 39 = \ldots\)
9. \(24 + 20 = \ldots\)
10. \(35 + 20 = \ldots\)
11. \(19 + 66 = \ldots\)
12. \(78 + 14 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 11 + 50\\= &50+11\\= &50 + \color{green}{10} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
2. \(\begin{align} & 71 + 12\\= & \color{green}{70} + \color{red}{1} + \color{green}{10} + \color{red}{2} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
3. \(\begin{align} & 40 + 30\\= &40 + \color{green}{30} + \color{red}{0} \\= & \color{green}{70} + \color{red}{0} \\= & \color{red}{70} \end{align}\)
4. \(\begin{align} & 72 + 15\\= & \color{green}{70} + \color{red}{2} + \color{green}{10} + \color{red}{5} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
5. \(\begin{align} & 30 + 14\\= &30 + \color{green}{10} + \color{red}{4} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
6. \(\begin{align} & 77 + 16\\= & \color{green}{70} + \color{red}{7} + \color{green}{10} + \color{red}{6} \\= & \color{green}{80} + \color{red}{13} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
7. \(\begin{align} & 51 + 27\\= & \color{green}{50} + \color{red}{1} + \color{green}{20} + \color{red}{7} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
8. \(\begin{align} & 57 + 39\\= & \color{green}{50} + \color{red}{7} + \color{green}{30} + \color{red}{9} \\= & \color{green}{80} + \color{red}{16} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{6} \\= & \color{orange}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
9. \(\begin{align} & 24 + 20\\= &20+24\\= &20 + \color{green}{20} + \color{red}{4} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
10. \(\begin{align} & 35 + 20\\= &20+35\\= &20 + \color{green}{30} + \color{red}{5} \\= & \color{green}{50} + \color{red}{5} \\= & \color{red}{55} \end{align}\)
11. \(\begin{align} & 19 + 66\\= & \color{green}{10} + \color{red}{9} + \color{green}{60} + \color{red}{6} \\= & \color{green}{70} + \color{red}{15} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{5} \\= & \color{orange}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
12. \(\begin{align} & 78 + 14\\= & \color{green}{70} + \color{red}{8} + \color{green}{10} + \color{red}{4} \\= & \color{green}{80} + \color{red}{12} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)