Brug Mix (reeks 2)

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1. \(28 + 11 = \ldots\)
2. \(75 + 18 = \ldots\)
3. \(23 + 69 = \ldots\)
4. \(38 + 40 = \ldots\)
5. \(38 + 11 = \ldots\)
6. \(52 + 11 = \ldots\)
7. \(69 + 14 = \ldots\)
8. \(19 + 10 = \ldots\)
9. \(74 + 10 = \ldots\)
10. \(68 + 22 = \ldots\)
11. \(43 + 20 = \ldots\)
12. \(49 + 24 = \ldots\)

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Verbetersleutel

1. \(\begin{align} & 28 + 11\\= & \color{green}{20} + \color{red}{8} + \color{green}{10} + \color{red}{1} \\= & \color{green}{30} + \color{red}{9} \\= & \color{red}{39} \end{align}\)
2. \(\begin{align} & 75 + 18\\= & \color{green}{70} + \color{red}{5} + \color{green}{10} + \color{red}{8} \\= & \color{green}{80} + \color{red}{13} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
3. \(\begin{align} & 23 + 69\\= & \color{green}{20} + \color{red}{3} + \color{green}{60} + \color{red}{9} \\= & \color{green}{80} + \color{red}{12} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{2} \\= & \color{orange}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)
4. \(\begin{align} & 38 + 40\\= &40+38\\= &40 + \color{green}{30} + \color{red}{8} \\= & \color{green}{70} + \color{red}{8} \\= & \color{red}{78} \end{align}\)
5. \(\begin{align} & 38 + 11\\= & \color{green}{30} + \color{red}{8} + \color{green}{10} + \color{red}{1} \\= & \color{green}{40} + \color{red}{9} \\= & \color{red}{49} \end{align}\)
6. \(\begin{align} & 52 + 11\\= & \color{green}{50} + \color{red}{2} + \color{green}{10} + \color{red}{1} \\= & \color{green}{60} + \color{red}{3} \\= & \color{red}{63} \end{align}\)
7. \(\begin{align} & 69 + 14\\= & \color{green}{60} + \color{red}{9} + \color{green}{10} + \color{red}{4} \\= & \color{green}{70} + \color{red}{13} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{80} + \color{red}{3} \\= & \color{red}{83} \end{align}\)
8. \(\begin{align} & 19 + 10\\= &10+19\\= &10 + \color{green}{10} + \color{red}{9} \\= & \color{green}{20} + \color{red}{9} \\= & \color{red}{29} \end{align}\)
9. \(\begin{align} & 74 + 10\\= &10+74\\= &10 + \color{green}{70} + \color{red}{4} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
10. \(\begin{align} & 68 + 22\\= & \color{green}{60} + \color{red}{8} + \color{green}{20} + \color{red}{2} \\= & \color{green}{80} + \color{red}{10} \\= & \color{red}{90} \end{align}\)
11. \(\begin{align} & 43 + 20\\= &20+43\\= &20 + \color{green}{40} + \color{red}{3} \\= & \color{green}{60} + \color{red}{3} \\= & \color{red}{63} \end{align}\)
12. \(\begin{align} & 49 + 24\\= & \color{green}{40} + \color{red}{9} + \color{green}{20} + \color{red}{4} \\= & \color{green}{60} + \color{red}{13} \\= & \color{green}{60} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{70} + \color{red}{3} \\= & \color{red}{73} \end{align}\)