Which prefix represents one hundredth of a base unit?

The prefix that represents one hundredth of a base unit is "centi." In the metric system, the centi- prefix indicates a factor of one hundredth (1/100 or 10^-2). For example, one centimeter is equal to one hundredth of a meter. This prefix is widely used in various measurements, such as length, volume, and mass.

The other prefixes mentioned do not represent one hundredth of a base unit. "Deci-" signifies one tenth (1/10 or 10^-1), "milli-" represents one thousandth (1/1000 or 10^-3), and "micro-" denotes one millionth (1/1,000,000 or 10^-6). Understanding these metric prefixes is essential as they provide a standardized way to express measurements across different domains.