The number "5.5" is a decimal number that represents a value between 5 and 6. It can be expressed as a fraction, specifically 11/2, which indicates that it is halfway between the whole numbers 5 and 6. In mathematics, decimals like 5.5 are used to represent non-integer values, making them useful in various calculations. In everyday life, 5.5 can be used in contexts such as measuring distances, weights, or ratings. For example, a product might receive a score of 5.5 out of 10 in a review, indicating it is slightly above average. This decimal format allows for more precise communication of values.