What fraction of a millennium is a century?

Answer 1

A century is 100 years, and a millennium is 1000 years, so a millennium has 10 centuries.

Answer 2

1 century = 100 years

1 millennium = 1000 years

The fraction of 1 century that is a millennium is:

millennium/century = 1000 years/100 years = 10.

Answer 3

It's either 1/10 or 1/100

Answer 4

The relevant fraction is 10 [or 1000%].