| $$ \begin{aligned}\frac{\frac{\frac{2}{3}}{10}}{11}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}\frac{\frac{\frac{1}{3}}{5}}{11}\end{aligned} $$ | |
| ① | Divide both numerator and denominator by 2. |