the prefix cent- means a hundred, just like mill- means a thousand.
so in a century there are 100 years, just as in a millennium there are 1000 years.
in 90 centuries that's 90 x 100 = 9000 years
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There are 400 years in four centuries.
100 years = 1 century ⇒ 2500 years = 2500 ÷ 100 centuries = 25 centuries
A century is 100 years, so 2 centuries is 200 years.
4.5 centuries is 450 years. There are 100 years in a century.
3 centuries = 300 years