You use a number element to store a numerical value.
Creating a number component
You create a number component when you want to reuse a
numerical value in multiple places in your website.
Adding a number element to an item
You add a number element to a site area or content item
when you want a numerical value to be used for a specific site area
or content item.
Adding a number element to a template
You add a number element to an authoring template when
you want the number element to be used by a set of items that use
the same authoring template.