Brug Mix (reeks 2)

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1. \(72 + 10 = \ldots\)
2. \(38 + 44 = \ldots\)
3. \(41 + 44 = \ldots\)
4. \(80 + 17 = \ldots\)
5. \(62 + 20 = \ldots\)
6. \(19 + 14 = \ldots\)
7. \(15 + 59 = \ldots\)
8. \(58 + 35 = \ldots\)
9. \(55 + 23 = \ldots\)
10. \(11 + 41 = \ldots\)
11. \(77 + 14 = \ldots\)
12. \(48 + 33 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 72 + 10\\= &10+72\\= &10 + \color{green}{70} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
2. \(\begin{align} & 38 + 44\\= & \color{green}{30} + \color{red}{8} + \color{green}{40} + \color{red}{4} \\= & \color{green}{70} + \color{red}{12} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
3. \(\begin{align} & 41 + 44\\= & \color{green}{40} + \color{red}{1} + \color{green}{40} + \color{red}{4} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
4. \(\begin{align} & 80 + 17\\= &80 + \color{green}{10} + \color{red}{7} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
5. \(\begin{align} & 62 + 20\\= &20+62\\= &20 + \color{green}{60} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
6. \(\begin{align} & 19 + 14\\= & \color{green}{10} + \color{red}{9} + \color{green}{10} + \color{red}{4} \\= & \color{green}{20} + \color{red}{13} \\= & \color{green}{20} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{30} + \color{red}{3} \\= & \color{red}{33} \end{align}\)
7. \(\begin{align} & 15 + 59\\= & \color{green}{10} + \color{red}{5} + \color{green}{50} + \color{red}{9} \\= & \color{green}{60} + \color{red}{14} \\= & \color{green}{60} + \color{orange}{10} + \color{red}{4} \\= & \color{orange}{70} + \color{red}{4} \\= & \color{red}{74} \end{align}\)
8. \(\begin{align} & 58 + 35\\= & \color{green}{50} + \color{red}{8} + \color{green}{30} + \color{red}{5} \\= & \color{green}{80} + \color{red}{13} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
9. \(\begin{align} & 55 + 23\\= & \color{green}{50} + \color{red}{5} + \color{green}{20} + \color{red}{3} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
10. \(\begin{align} & 11 + 41\\= & \color{green}{10} + \color{red}{1} + \color{green}{40} + \color{red}{1} \\= & \color{green}{50} + \color{red}{2} \\= & \color{red}{52} \end{align}\)
11. \(\begin{align} & 77 + 14\\= & \color{green}{70} + \color{red}{7} + \color{green}{10} + \color{red}{4} \\= & \color{green}{80} + \color{red}{11} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
12. \(\begin{align} & 48 + 33\\= & \color{green}{40} + \color{red}{8} + \color{green}{30} + \color{red}{3} \\= & \color{green}{70} + \color{red}{11} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)