Half of 5 is 2.5.
To find half of a number, you divide it by 2. So, when you divide 5 by 2, you get 2.5. This means that if you have 5 items and you want to split them into two equal groups, each group would contain 2.5 items. In practical terms, this often translates to having 2 whole items and a half of another item.