Centenary means hundred year old.. it can be anything like an organisation, a person's lifetime etc.
centenary, centennial
centennial, centenary
centenary, centennial
There's no such thing as "the nearest decimal point". If you mean "the nearest whole number" ... I'm stretching here, trying to invest your question with some meaning ... then the answer is zero.
centenary
Hundredth century
Centenary.
non-centenary
A centenary is a celebration of 100 years.
Centenary Cup happened in 1984.
Centenary Building was created in 1995.
Centenary Institute was created in 1989.
Centenary Bridge was created in 1964.
Centenary District's population is 121,127.
Centenary Bank was created in 1983.
The population of Centenary Bank is 2,010.
Centenary College is located in the state of Louisiana.