Brug Mix (reeks 2)

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1. \(49 + 43 = \ldots\)
2. \(80 + 1 = \ldots\)
3. \(86 + 1 = \ldots\)
4. \(35 + 33 = \ldots\)
5. \(46 + 39 = \ldots\)
6. \(33 + 11 = \ldots\)
7. \(73 + 16 = \ldots\)
8. \(72 + 11 = \ldots\)
9. \(33 + 30 = \ldots\)
10. \(21 + 29 = \ldots\)
11. \(31 + 50 = \ldots\)
12. \(66 + 26 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 49 + 43\\= & \color{green}{40} + \color{red}{9} + \color{green}{40} + \color{red}{3} \\= & \color{green}{80} + \color{red}{12} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
2. \(\begin{align} & 80 + 1\\= &80 + \color{green}{0} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
3. \(\begin{align} & 86 + 1\\= & \color{green}{80} + \color{red}{6} + \color{green}{0} + \color{red}{1} \\= & \color{green}{80} + \color{red}{7} \\= & \color{red}{87} \end{align}\)
4. \(\begin{align} & 35 + 33\\= & \color{green}{30} + \color{red}{5} + \color{green}{30} + \color{red}{3} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)
5. \(\begin{align} & 46 + 39\\= & \color{green}{40} + \color{red}{6} + \color{green}{30} + \color{red}{9} \\= & \color{green}{70} + \color{red}{15} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{5} \\= & \color{orange}{80} + \color{red}{5} \\= & \color{red}{85} \end{align}\)
6. \(\begin{align} & 33 + 11\\= & \color{green}{30} + \color{red}{3} + \color{green}{10} + \color{red}{1} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
7. \(\begin{align} & 73 + 16\\= & \color{green}{70} + \color{red}{3} + \color{green}{10} + \color{red}{6} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
8. \(\begin{align} & 72 + 11\\= & \color{green}{70} + \color{red}{2} + \color{green}{10} + \color{red}{1} \\= & \color{green}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
9. \(\begin{align} & 33 + 30\\= &30+33\\= &30 + \color{green}{30} + \color{red}{3} \\= & \color{green}{60} + \color{red}{3} \\= & \color{red}{63} \end{align}\)
10. \(\begin{align} & 21 + 29\\= & \color{green}{20} + \color{red}{1} + \color{green}{20} + \color{red}{9} \\= & \color{green}{40} + \color{red}{10} \\= & \color{red}{50} \end{align}\)
11. \(\begin{align} & 31 + 50\\= &50+31\\= &50 + \color{green}{30} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
12. \(\begin{align} & 66 + 26\\= & \color{green}{60} + \color{red}{6} + \color{green}{20} + \color{red}{6} \\= & \color{green}{80} + \color{red}{12} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)