Questions: Typically, the sale of homes is the largest number nationally, more than: homes.

The question seems to be asking which category of homes typically has the largest number of sales nationally. Let's evaluate each option:

1. Single-family homes: These are standalone residential structures that do not share walls with other homes. They are the most common type of housing in many countries, especially in suburban areas.

2. Residential homes: This is a broad category that includes all types of homes where people live, such as single-family homes, apartments, condos, etc. However, it is not specific enough to determine which type has the largest number of sales.

3. New and custom-built homes: These are homes that are newly constructed or specifically designed and built for a particular buyer. While they are a significant part of the housing market, they typically represent a smaller segment compared to existing home sales.

The answer is the first one: single-family homes. Single-family homes generally have the largest number of sales nationally compared to other specific categories like new and custom-built homes. Residential homes as a category is too broad to be useful in this context.