a/b + c/d = (ad+bc) / bd .


1/2 + 1/2 = (1x2+2x1)/(2x2) = (2+2)/4 = 4/4 = 1/1.

52 / 96

GCF (52,96) = 
GCF (96,52%96) = GCF (96,52) =
GCF (52,96%52) = GCF (52,44) = 
GCF (44,52%44) = GCF (44,8) = 
GCF (8,44%8) = GCF (8,4) = 
GCF (4,8%4) = GCF (4,0) = 4.

52/4   /  96/4   =  13 / 14

A View Controller contains a View.  The View may contain other "Views" as well.  An app may have many view controllers.