Brug Mix (reeks 2)

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1. \(50 + 27 = \ldots\)
2. \(52 + 14 = \ldots\)
3. \(66 + 25 = \ldots\)
4. \(41 + 28 = \ldots\)
5. \(35 + 48 = \ldots\)
6. \(69 + 13 = \ldots\)
7. \(89 + 1 = \ldots\)
8. \(22 + 56 = \ldots\)
9. \(23 + 22 = \ldots\)
10. \(38 + 14 = \ldots\)
11. \(19 + 56 = \ldots\)
12. \(61 + 25 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 50 + 27\\= &50 + \color{green}{20} + \color{red}{7} \\= & \color{green}{70} + \color{red}{7} \\= & \color{red}{77} \end{align}\)
2. \(\begin{align} & 52 + 14\\= & \color{green}{50} + \color{red}{2} + \color{green}{10} + \color{red}{4} \\= & \color{green}{60} + \color{red}{6} \\= & \color{red}{66} \end{align}\)
3. \(\begin{align} & 66 + 25\\= & \color{green}{60} + \color{red}{6} + \color{green}{20} + \color{red}{5} \\= & \color{green}{80} + \color{red}{11} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
4. \(\begin{align} & 41 + 28\\= & \color{green}{40} + \color{red}{1} + \color{green}{20} + \color{red}{8} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
5. \(\begin{align} & 35 + 48\\= & \color{green}{30} + \color{red}{5} + \color{green}{40} + \color{red}{8} \\= & \color{green}{70} + \color{red}{13} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
6. \(\begin{align} & 69 + 13\\= & \color{green}{60} + \color{red}{9} + \color{green}{10} + \color{red}{3} \\= & \color{green}{70} + \color{red}{12} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
7. \(\begin{align} & 89 + 1\\= & \color{green}{80} + \color{red}{9} + \color{green}{0} + \color{red}{1} \\= & \color{green}{80} + \color{red}{10} \\= & \color{red}{90} \end{align}\)
8. \(\begin{align} & 22 + 56\\= & \color{green}{20} + \color{red}{2} + \color{green}{50} + \color{red}{6} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
9. \(\begin{align} & 23 + 22\\= & \color{green}{20} + \color{red}{3} + \color{green}{20} + \color{red}{2} \\= & \color{green}{40} + \color{red}{5} \\= & \color{red}{45} \end{align}\)
10. \(\begin{align} & 38 + 14\\= & \color{green}{30} + \color{red}{8} + \color{green}{10} + \color{red}{4} \\= & \color{green}{40} + \color{red}{12} \\= & \color{green}{40} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{50} + \color{red}{2} \\= & \color{red}{52} \end{align}\)
11. \(\begin{align} & 19 + 56\\= & \color{green}{10} + \color{red}{9} + \color{green}{50} + \color{red}{6} \\= & \color{green}{60} + \color{red}{15} \\= & \color{green}{60} + \color{orange}{10} + \color{red}{5} \\= & \color{orange}{70} + \color{red}{5} \\= & \color{red}{75} \end{align}\)
12. \(\begin{align} & 61 + 25\\= & \color{green}{60} + \color{red}{1} + \color{green}{20} + \color{red}{5} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)