$$ \begin{aligned}\frac{6}{18}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}} \frac{ 6 : \color{orangered}{ 6 } }{ 18 : \color{orangered}{ 6 }} \xlongequal{ } \\[1 em] & \xlongequal{ }\frac{1}{3}\end{aligned} $$ | |
① | Divide both the top and bottom numbers by $ \color{orangered}{ 6 } $. |