Final answer:
The specific mathematical operation used to calculate the "location factor" for KFC stores in Japan is not provided, but location factors typically involve various operations based on numerous data points.
Step-by-step explanation:
The calculation of the "location factor" for KFC store sites in Japan would depend on the specific formula that KFC uses to evaluate potential store locations. However, without specific context or a reference to a known formula that KFC uses, it is not possible to accurately determine which mathematical operation is performed. Location factors for businesses often incorporate a variety of data points, including demographics, competition, local market conditions, and others which may involve multiple mathematical operations, not limited to addition, subtraction, multiplication, or division.