Respuesta :
3/4 i believe, you simply divide both numbers by 84 to get your answer
[tex]\dfrac{252}{336}=\dfrac{252:2}{336:2}=\dfrac{126:2}{168:2}=\dfrac{63:3}{84:3}=\dfrac{21:7}{28:7}=\dfrac{3}{4}\\\\Answer:\boxed{\frac{252}{336}=\frac{3}{4}}[/tex]