The default widget for any number item does not include a control for setting the number. The semantic points here are not relevant; they are just tags that determine where in the overview property and equipment tags these items are found.
Every item has two default widgets, a default stand-alone widget (such as you see on the items details page) and a default lit widget for when that item is included in one of the overview style lists or other group lists. You can change these defaults if you wish to develop your own widget. Here are a few great places to get started: