The number "1.5" is a decimal that represents a value between 1 and 2. It can also be expressed as a fraction, specifically 3/2, indicating that it is one and a half units of something. This number is commonly used in various contexts, such as measurements, statistics, and everyday calculations. In mathematics, "1.5" can be found in different applications, including averages and percentages. For example, if a student scores 1.5 out of 2 on a test, it indicates they performed well, achieving 75% of the total possible score. Understanding decimal values like "1.5" is essential for interpreting data accurately.