What is 2.5 as a decimal?

The decimal representation of 2.5 is simply 2.5. It can be written as 2.5 or 2.500 (with trailing zeros). The decimal point separates the whole number part (2) from the decimal part (0.5). It indicates that there are 2 whole units and a half unit. In terms of fractions, 2.5 is the same as 5/2 or ½. Therefore, 2.5 is a rational number and a terminating decimal.