| $$ \begin{aligned}\frac{225920}{12002}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}} \frac{ 225920 : \color{orangered}{ 706 } }{ 12002 : \color{orangered}{ 706 }} \xlongequal{ } \\[1 em] & \xlongequal{ }\frac{320}{17}\end{aligned} $$ | |
| ① | Divide both the top and bottom numbers by $ \color{orangered}{ 706 } $. |