Final answer:
Page numbers in a report layout are most commonly displayed at the bottom of every page, also known as the footer.
Step-by-step explanation:
In the context of a report layout, the page number is typically displayed at the bottom of every page. This is a common practice that allows readers to easily locate their place within the document, should they need to reference or navigate to a specific page. There are occurrences when the page number might appear at the top of every page, but this is less conventional in formal reports. The position at the bottom of the page is often referred to as a 'footer,' whereas the top of the page would be the 'header.'