Hi! -0.327 is not a rational number. A rational number is a number that can be express as the ratio of two integers. For example, one third can be expressed as 1 divided by 3, and since 1 and 3 are both integers, one third is a rational number. Likewise, any integer can be expressed as the ratio of two integers, thus all integers are rational. I hope this helps you! Good luck and have a great day/night. ❤️✨