$$ \begin{aligned}\frac{299}{156}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}} \frac{ 299 : \color{orangered}{ 13 } }{ 156 : \color{orangered}{ 13 }} \xlongequal{ } \\[1 em] & \xlongequal{ }\frac{23}{12}\end{aligned} $$ | |
① | Divide both the top and bottom numbers by $ \color{orangered}{ 13 } $. |