\(\dfrac{153153}{174174}=\dfrac{153153:3003}{174174:3003}=\dfrac{51}{58}\)
\(\dfrac{19}{57}=\dfrac{19:19}{57:19}=\dfrac{1}{33}\)
\(\dfrac{36}{72}=\dfrac{36:36}{72:36}=\dfrac{1}{2}\)
\(\dfrac{202020}{303030}=\dfrac{202020:101010}{303030:101010}=\dfrac{2}{3}\)