Brug Mix (reeks 2)

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1. \(49 + 21 = \ldots\)
2. \(57 + 29 = \ldots\)
3. \(45 + 44 = \ldots\)
4. \(45 + 27 = \ldots\)
5. \(51 + 30 = \ldots\)
6. \(75 + 15 = \ldots\)
7. \(34 + 41 = \ldots\)
8. \(68 + 15 = \ldots\)
9. \(53 + 11 = \ldots\)
10. \(44 + 16 = \ldots\)
11. \(17 + 53 = \ldots\)
12. \(50 + 31 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 49 + 21\\= & \color{green}{40} + \color{red}{9} + \color{green}{20} + \color{red}{1} \\= & \color{green}{60} + \color{red}{10} \\= & \color{red}{70} \end{align}\)
2. \(\begin{align} & 57 + 29\\= & \color{green}{50} + \color{red}{7} + \color{green}{20} + \color{red}{9} \\= & \color{green}{70} + \color{red}{16} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{6} \\= & \color{orange}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
3. \(\begin{align} & 45 + 44\\= & \color{green}{40} + \color{red}{5} + \color{green}{40} + \color{red}{4} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
4. \(\begin{align} & 45 + 27\\= & \color{green}{40} + \color{red}{5} + \color{green}{20} + \color{red}{7} \\= & \color{green}{60} + \color{red}{12} \\= & \color{green}{60} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
5. \(\begin{align} & 51 + 30\\= &30+51\\= &30 + \color{green}{50} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
6. \(\begin{align} & 75 + 15\\= & \color{green}{70} + \color{red}{5} + \color{green}{10} + \color{red}{5} \\= & \color{green}{80} + \color{red}{10} \\= & \color{red}{90} \end{align}\)
7. \(\begin{align} & 34 + 41\\= & \color{green}{30} + \color{red}{4} + \color{green}{40} + \color{red}{1} \\= & \color{green}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
8. \(\begin{align} & 68 + 15\\= & \color{green}{60} + \color{red}{8} + \color{green}{10} + \color{red}{5} \\= & \color{green}{70} + \color{red}{13} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
9. \(\begin{align} & 53 + 11\\= & \color{green}{50} + \color{red}{3} + \color{green}{10} + \color{red}{1} \\= & \color{green}{60} + \color{red}{4} \\= & \color{red}{64} \end{align}\)
10. \(\begin{align} & 44 + 16\\= & \color{green}{40} + \color{red}{4} + \color{green}{10} + \color{red}{6} \\= & \color{green}{50} + \color{red}{10} \\= & \color{red}{60} \end{align}\)
11. \(\begin{align} & 17 + 53\\= & \color{green}{10} + \color{red}{7} + \color{green}{50} + \color{red}{3} \\= & \color{green}{60} + \color{red}{10} \\= & \color{red}{70} \end{align}\)
12. \(\begin{align} & 50 + 31\\= &50 + \color{green}{30} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)