I'm sure this has been answered somewhere, sometime before, but my Google-fu is failing me.
What happens when a template is added to a creature with a fractional CR?
For instance, I need an advanced giant hawk. According to the Bestiary preview, a normal hawk has a CR of 1/3, and the Advanced Creature and Giant Creature templates each add +1 to the CR, for a total CR of 2-1/3.
What is the advanced giant hawk's final CR? Do I ignore or round down the original 1/3 and make it CR 2, or round up to CR 3?