# Hundred

**One hundred** (100) is the

natural number following

ninety-nine and preceding

one hundred one. In

scientific notation, it is written as 10

^{2}. The standard

SI prefix for a hundred is "

hecto-". The

Roman numeral for hundred is

C (for

*centum*). This number is important as the basis of

percentages (literally "per hundred"), with 100% being a full amount. It is used in many physical units.

*See also*: List of numbers, Hundred (division), century, the year AD 100