Brug Mix (reeks 2)

Hoofdmenu Eentje per keer  🖨

Reken uit

1. \(89 + 4 = \ldots\)
2. \(12 + 53 = \ldots\)
3. \(83 + 12 = \ldots\)
4. \(51 + 30 = \ldots\)
5. \(85 + 12 = \ldots\)
6. \(65 + 19 = \ldots\)
7. \(11 + 78 = \ldots\)
8. \(49 + 37 = \ldots\)
9. \(63 + 21 = \ldots\)
10. \(29 + 38 = \ldots\)
11. \(79 + 11 = \ldots\)
12. \(18 + 79 = \ldots\)

---

Reken uit

Verbetersleutel

1. \(\begin{align} & 89 + 4\\= & \color{green}{80} + \color{red}{9} + \color{green}{0} + \color{red}{4} \\= & \color{green}{80} + \color{red}{13} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{3} \\= & \color{orange}{90} + \color{red}{3} \\= & \color{red}{93} \end{align}\)
2. \(\begin{align} & 12 + 53\\= & \color{green}{10} + \color{red}{2} + \color{green}{50} + \color{red}{3} \\= & \color{green}{60} + \color{red}{5} \\= & \color{red}{65} \end{align}\)
3. \(\begin{align} & 83 + 12\\= & \color{green}{80} + \color{red}{3} + \color{green}{10} + \color{red}{2} \\= & \color{green}{90} + \color{red}{5} \\= & \color{red}{95} \end{align}\)
4. \(\begin{align} & 51 + 30\\= &30+51\\= &30 + \color{green}{50} + \color{red}{1} \\= & \color{green}{80} + \color{red}{1} \\= & \color{red}{81} \end{align}\)
5. \(\begin{align} & 85 + 12\\= & \color{green}{80} + \color{red}{5} + \color{green}{10} + \color{red}{2} \\= & \color{green}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)
6. \(\begin{align} & 65 + 19\\= & \color{green}{60} + \color{red}{5} + \color{green}{10} + \color{red}{9} \\= & \color{green}{70} + \color{red}{14} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{4} \\= & \color{orange}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
7. \(\begin{align} & 11 + 78\\= & \color{green}{10} + \color{red}{1} + \color{green}{70} + \color{red}{8} \\= & \color{green}{80} + \color{red}{9} \\= & \color{red}{89} \end{align}\)
8. \(\begin{align} & 49 + 37\\= & \color{green}{40} + \color{red}{9} + \color{green}{30} + \color{red}{7} \\= & \color{green}{70} + \color{red}{16} \\= & \color{green}{70} + \color{orange}{10} + \color{red}{6} \\= & \color{orange}{80} + \color{red}{6} \\= & \color{red}{86} \end{align}\)
9. \(\begin{align} & 63 + 21\\= & \color{green}{60} + \color{red}{3} + \color{green}{20} + \color{red}{1} \\= & \color{green}{80} + \color{red}{4} \\= & \color{red}{84} \end{align}\)
10. \(\begin{align} & 29 + 38\\= & \color{green}{20} + \color{red}{9} + \color{green}{30} + \color{red}{8} \\= & \color{green}{50} + \color{red}{17} \\= & \color{green}{50} + \color{orange}{10} + \color{red}{7} \\= & \color{orange}{60} + \color{red}{7} \\= & \color{red}{67} \end{align}\)
11. \(\begin{align} & 79 + 11\\= & \color{green}{70} + \color{red}{9} + \color{green}{10} + \color{red}{1} \\= & \color{green}{80} + \color{red}{10} \\= & \color{red}{90} \end{align}\)
12. \(\begin{align} & 18 + 79\\= & \color{green}{10} + \color{red}{8} + \color{green}{70} + \color{red}{9} \\= & \color{green}{80} + \color{red}{17} \\= & \color{green}{80} + \color{orange}{10} + \color{red}{7} \\= & \color{orange}{90} + \color{red}{7} \\= & \color{red}{97} \end{align}\)