Brug Mix (reeks 2)

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1. \(66 + 20 = \ldots\)
2. \(69 + 20 = \ldots\)
3. \(82 + 3 = \ldots\)
4. \(69 + 24 = \ldots\)
5. \(66 + 11 = \ldots\)
6. \(44 + 18 = \ldots\)
7. \(88 + 1 = \ldots\)
8. \(10 + 51 = \ldots\)
9. \(88 + 7 = \ldots\)
10. \(75 + 14 = \ldots\)
11. \(85 + 14 = \ldots\)
12. \(36 + 13 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 66 + 20\\= &20+66\\= &20 + \color{green}{60} + \color{red}{6} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
2. \(\begin{align} & 69 + 20\\= &20+69\\= &20 + \color{green}{60} + \color{red}{9} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
3. \(\begin{align} & 82 + 3\\= & \color{green}{80} + \color{red}{2} + \color{green}{0} + \color{red}{3} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
4. \(\begin{align} & 69 + 24\\= & \color{green}{60} + \color{red}{9} + \color{green}{20} + \color{red}{4} \\= & \color{green}{80} + \color{red}{13} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
5. \(\begin{align} & 66 + 11\\= & \color{green}{60} + \color{red}{6} + \color{green}{10} + \color{red}{1} \\= & \color{green}{70} + \color{red}{7} \\= & \color{red}{77} \end{align}\)
6. \(\begin{align} & 44 + 18\\= & \color{green}{40} + \color{red}{4} + \color{green}{10} + \color{red}{8} \\= & \color{green}{50} + \color{red}{12} \\= & \color{green}{50} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{60} + \color{red}{2} \\= & \color{red}{62} \end{align}\)
7. \(\begin{align} & 88 + 1\\= & \color{green}{80} + \color{red}{8} + \color{green}{0} + \color{red}{1} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
8. \(\begin{align} & 10 + 51\\= &10 + \color{green}{50} + \color{red}{1} \\= & \color{green}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
9. \(\begin{align} & 88 + 7\\= & \color{green}{80} + \color{red}{8} + \color{green}{0} + \color{red}{7} \\= & \color{green}{80} + \color{red}{15} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{5} \\= & \color{orange}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
10. \(\begin{align} & 75 + 14\\= & \color{green}{70} + \color{red}{5} + \color{green}{10} + \color{red}{4} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
11. \(\begin{align} & 85 + 14\\= & \color{green}{80} + \color{red}{5} + \color{green}{10} + \color{red}{4} \\= & \color{green}{90} + \color{red}{9} \\= & \color{red}{99} \end{align}\)
12. \(\begin{align} & 36 + 13\\= & \color{green}{30} + \color{red}{6} + \color{green}{10} + \color{red}{3} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)