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A century is 100 years, and a millennium is 1000 years, so a millennium has 10 centuries.
There are 100 years in a century. There are 1000 years in a millennium.
decade:10 years century:100 years millennium:1000 years
1000 years. One century is 100 years.
The tenth century spans the years from 901 - 1000. Note that not all people agree on this, and many believe that 1000 is the first year of the eleventh century; but if you count 100 years at once, starting at year 1, the situation is quite clear: the 1st. century is from 1-100, the 2nd century is from 101-200, etc.