Brug Mix (reeks 2)

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1. \(76 + 10 = \ldots\)
2. \(27 + 42 = \ldots\)
3. \(75 + 14 = \ldots\)
4. \(12 + 60 = \ldots\)
5. \(75 + 11 = \ldots\)
6. \(30 + 52 = \ldots\)
7. \(77 + 14 = \ldots\)
8. \(22 + 20 = \ldots\)
9. \(17 + 71 = \ldots\)
10. \(39 + 22 = \ldots\)
11. \(79 + 12 = \ldots\)
12. \(15 + 34 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 76 + 10\\= &10+76\\= &10 + \color{green}{70} + \color{red}{6} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
2. \(\begin{align} & 27 + 42\\= & \color{green}{20} + \color{red}{7} + \color{green}{40} + \color{red}{2} \\= & \color{green}{60} + \color{red}{9} \\= & \color{red}{69} \end{align}\)
3. \(\begin{align} & 75 + 14\\= & \color{green}{70} + \color{red}{5} + \color{green}{10} + \color{red}{4} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
4. \(\begin{align} & 12 + 60\\= &60+12\\= &60 + \color{green}{10} + \color{red}{2} \\= & \color{green}{70} + \color{red}{2} \\= & \color{red}{72} \end{align}\)
5. \(\begin{align} & 75 + 11\\= & \color{green}{70} + \color{red}{5} + \color{green}{10} + \color{red}{1} \\= & \color{green}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
6. \(\begin{align} & 30 + 52\\= &30 + \color{green}{50} + \color{red}{2} \\= & \color{green}{80} + \color{red}{2} \\= & \color{red}{82} \end{align}\)
7. \(\begin{align} & 77 + 14\\= & \color{green}{70} + \color{red}{7} + \color{green}{10} + \color{red}{4} \\= & \color{green}{80} + \color{red}{11} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
8. \(\begin{align} & 22 + 20\\= &20+22\\= &20 + \color{green}{20} + \color{red}{2} \\= & \color{green}{40} + \color{red}{2} \\= & \color{red}{42} \end{align}\)
9. \(\begin{align} & 17 + 71\\= & \color{green}{10} + \color{red}{7} + \color{green}{70} + \color{red}{1} \\= & \color{green}{80} + \color{red}{8} \\= & \color{red}{88} \end{align}\)
10. \(\begin{align} & 39 + 22\\= & \color{green}{30} + \color{red}{9} + \color{green}{20} + \color{red}{2} \\= & \color{green}{50} + \color{red}{11} \\= & \color{green}{50} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{60} + \color{red}{1} \\= & \color{red}{61} \end{align}\)
11. \(\begin{align} & 79 + 12\\= & \color{green}{70} + \color{red}{9} + \color{green}{10} + \color{red}{2} \\= & \color{green}{80} + \color{red}{11} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{1} \\= & \color{orange}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
12. \(\begin{align} & 15 + 34\\= & \color{green}{10} + \color{red}{5} + \color{green}{30} + \color{red}{4} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)