Brug over tiental

Hoofdmenu Eentje per keer  🖨

Reken uit

1. \(18 + 3 = \ldots\)
2. \(5 + 46 = \ldots\)
3. \(9 + 12 = \ldots\)
4. \(59 + 9 = \ldots\)
5. \(64 + 7 = \ldots\)
6. \(9 + 82 = \ldots\)
7. \(8 + 17 = \ldots\)
8. \(8 + 55 = \ldots\)
9. \(7 + 18 = \ldots\)
10. \(15 + 9 = \ldots\)
11. \(6 + 38 = \ldots\)
12. \(7 + 85 = \ldots\)

---

Reken uit

Verbetersleutel

1. \(\begin{align} & 18 + 3 \\= & 18 + \color{green}{2} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
2. \(\begin{align} & 5 + 46 \\= & 46 + 5 \\= & 46 + \color{green}{4} + \color{red}{1} \\= & \color{green}{50} + \color{red}{1} \\= & \color{red}{51} \end{align}\)
3. \(\begin{align} & 9 + 12 \\= & 12 + 9 \\= & 12 + \color{green}{8} + \color{red}{1} \\= & \color{green}{20} + \color{red}{1} \\= & \color{red}{21} \end{align}\)
4. \(\begin{align} & 59 + 9 \\= & 59 + \color{green}{1} + \color{red}{8} \\= & \color{green}{60} + \color{red}{8} \\= & \color{red}{68} \end{align}\)
5. \(\begin{align} & 64 + 7 \\= & 64 + \color{green}{6} + \color{red}{1} \\= & \color{green}{70} + \color{red}{1} \\= & \color{red}{71} \end{align}\)
6. \(\begin{align} & 9 + 82 \\= & 82 + 9 \\= & 82 + \color{green}{8} + \color{red}{1} \\= & \color{green}{90} + \color{red}{1} \\= & \color{red}{91} \end{align}\)
7. \(\begin{align} & 8 + 17 \\= & 17 + 8 \\= & 17 + \color{green}{3} + \color{red}{5} \\= & \color{green}{20} + \color{red}{5} \\= & \color{red}{25} \end{align}\)
8. \(\begin{align} & 8 + 55 \\= & 55 + 8 \\= & 55 + \color{green}{5} + \color{red}{3} \\= & \color{green}{60} + \color{red}{3} \\= & \color{red}{63} \end{align}\)
9. \(\begin{align} & 7 + 18 \\= & 18 + 7 \\= & 18 + \color{green}{2} + \color{red}{5} \\= & \color{green}{20} + \color{red}{5} \\= & \color{red}{25} \end{align}\)
10. \(\begin{align} & 15 + 9 \\= & 15 + \color{green}{5} + \color{red}{4} \\= & \color{green}{20} + \color{red}{4} \\= & \color{red}{24} \end{align}\)
11. \(\begin{align} & 6 + 38 \\= & 38 + 6 \\= & 38 + \color{green}{2} + \color{red}{4} \\= & \color{green}{40} + \color{red}{4} \\= & \color{red}{44} \end{align}\)
12. \(\begin{align} & 7 + 85 \\= & 85 + 7 \\= & 85 + \color{green}{5} + \color{red}{2} \\= & \color{green}{90} + \color{red}{2} \\= & \color{red}{92} \end{align}\)