Photo: Artazum (Shutterstock) Last weekend we talked about home bathroom sizes—as in, what you get in a half-bath versus a 3/4-bath or a full-bath. And while that information is necessary for decoding that terminology in real estate listings, there’s another part that isn’t exactly straightforward either: The total number of bathrooms in a home. Even though we use fractions as shorthand for describing how many fixtures are in a bathroom, you can’t simply add those fractions up to calculate the total number of bathrooms in a home, as it would appear in a real estate listing. In other words, two half-baths don’t equal one full-bath. Here are some tips for…