Brug Mix (reeks 2)

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1. \(31 + 10 = \ldots\)
2. \(54 + 25 = \ldots\)
3. \(76 + 16 = \ldots\)
4. \(17 + 55 = \ldots\)
5. \(79 + 16 = \ldots\)
6. \(73 + 19 = \ldots\)
7. \(32 + 22 = \ldots\)
8. \(58 + 26 = \ldots\)
9. \(68 + 25 = \ldots\)
10. \(59 + 14 = \ldots\)
11. \(25 + 21 = \ldots\)
12. \(21 + 10 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 31 + 10\\= &10+31\\= &10 + \color{green}{30} + \color{red}{1} \\= & \color{green}{40} + \color{red}{1} \\= & \color{red}{41} \end{align}\)
2. \(\begin{align} & 54 + 25\\= & \color{green}{50} + \color{red}{4} + \color{green}{20} + \color{red}{5} \\= & \color{green}{70} + \color{red}{9} \\= & \color{red}{79} \end{align}\)
3. \(\begin{align} & 76 + 16\\= & \color{green}{70} + \color{red}{6} + \color{green}{10} + \color{red}{6} \\= & \color{green}{80} + \color{red}{12} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
4. \(\begin{align} & 17 + 55\\= & \color{green}{10} + \color{red}{7} + \color{green}{50} + \color{red}{5} \\= & \color{green}{60} + \color{red}{12} \\= & \color{green}{60} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
5. \(\begin{align} & 79 + 16\\= & \color{green}{70} + \color{red}{9} + \color{green}{10} + \color{red}{6} \\= & \color{green}{80} + \color{red}{15} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{5} \\= & \color{orange}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
6. \(\begin{align} & 73 + 19\\= & \color{green}{70} + \color{red}{3} + \color{green}{10} + \color{red}{9} \\= & \color{green}{80} + \color{red}{12} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
7. \(\begin{align} & 32 + 22\\= & \color{green}{30} + \color{red}{2} + \color{green}{20} + \color{red}{2} \\= & \color{green}{50} + \color{red}{4} \\= & \color{red}{54} \end{align}\)
8. \(\begin{align} & 58 + 26\\= & \color{green}{50} + \color{red}{8} + \color{green}{20} + \color{red}{6} \\= & \color{green}{70} + \color{red}{14} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{4} \\= & \color{orange}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
9. \(\begin{align} & 68 + 25\\= & \color{green}{60} + \color{red}{8} + \color{green}{20} + \color{red}{5} \\= & \color{green}{80} + \color{red}{13} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
10. \(\begin{align} & 59 + 14\\= & \color{green}{50} + \color{red}{9} + \color{green}{10} + \color{red}{4} \\= & \color{green}{60} + \color{red}{13} \\= & \color{green}{60} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)
11. \(\begin{align} & 25 + 21\\= & \color{green}{20} + \color{red}{5} + \color{green}{20} + \color{red}{1} \\= & \color{green}{40} + \color{red}{6} \\= & \color{red}{46} \end{align}\)
12. \(\begin{align} & 21 + 10\\= &10+21\\= &10 + \color{green}{20} + \color{red}{1} \\= & \color{green}{30} + \color{red}{1} \\= & \color{red}{31} \end{align}\)