Brug Mix (reeks 2)

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1. \(16 + 61 = \ldots\)
2. \(52 + 15 = \ldots\)
3. \(21 + 55 = \ldots\)
4. \(33 + 10 = \ldots\)
5. \(65 + 24 = \ldots\)
6. \(12 + 79 = \ldots\)
7. \(45 + 23 = \ldots\)
8. \(47 + 49 = \ldots\)
9. \(69 + 11 = \ldots\)
10. \(10 + 40 = \ldots\)
11. \(23 + 61 = \ldots\)
12. \(43 + 42 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 16 + 61\\= & \color{green}{10} + \color{red}{6} + \color{green}{60} + \color{red}{1} \\= & \color{green}{70} + \color{red}{7} \\= & \color{red}{77} \end{align}\)
2. \(\begin{align} & 52 + 15\\= & \color{green}{50} + \color{red}{2} + \color{green}{10} + \color{red}{5} \\= & \color{green}{60} + \color{red}{7} \\= & \color{red}{67} \end{align}\)
3. \(\begin{align} & 21 + 55\\= & \color{green}{20} + \color{red}{1} + \color{green}{50} + \color{red}{5} \\= & \color{green}{70} + \color{red}{6} \\= & \color{red}{76} \end{align}\)
4. \(\begin{align} & 33 + 10\\= &10+33\\= &10 + \color{green}{30} + \color{red}{3} \\= & \color{green}{40} + \color{red}{3} \\= & \color{red}{43} \end{align}\)
5. \(\begin{align} & 65 + 24\\= & \color{green}{60} + \color{red}{5} + \color{green}{20} + \color{red}{4} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
6. \(\begin{align} & 12 + 79\\= & \color{green}{10} + \color{red}{2} + \color{green}{70} + \color{red}{9} \\= & \color{green}{80} + \color{red}{11} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
7. \(\begin{align} & 45 + 23\\= & \color{green}{40} + \color{red}{5} + \color{green}{20} + \color{red}{3} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)
8. \(\begin{align} & 47 + 49\\= & \color{green}{40} + \color{red}{7} + \color{green}{40} + \color{red}{9} \\= & \color{green}{80} + \color{red}{16} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{6} \\= & \color{orange}{90} + \color{red}{6} \\= & \color{red}{96} \end{align}\)
9. \(\begin{align} & 69 + 11\\= & \color{green}{60} + \color{red}{9} + \color{green}{10} + \color{red}{1} \\= & \color{green}{70} + \color{red}{10} \\= & \color{red}{80} \end{align}\)
10. \(\begin{align} & 10 + 40\\= &10 + \color{green}{40} + \color{red}{0} \\= & \color{green}{50} + \color{red}{0} \\= & \color{red}{50} \end{align}\)
11. \(\begin{align} & 23 + 61\\= & \color{green}{20} + \color{red}{3} + \color{green}{60} + \color{red}{1} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
12. \(\begin{align} & 43 + 42\\= & \color{green}{40} + \color{red}{3} + \color{green}{40} + \color{red}{2} \\= & \color{green}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)