The number 2.5 is already in decimal form. In this representation, the whole number part is 2, and the decimal part is .5, which indicates five-tenths or half of one unit.
To better understand it, you can think of decimals as a way to express numbers that fall between whole numbers. For instance, the number 2.5 lies between 2 and 3. In terms of fractions, 2.5 can also be written as 2 1/2 or 5/2.
Therefore, 2.5 represents a value that is greater than 2 but less than 3, making it a very useful way to convey precise quantities in various contexts, such as measurements or financial calculations.