A century is calculated by 100 years. A decade is 10 years. A millennium is 1000 years. A year is 12 months.
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150 centuries.
There are: 2.4 centuries
There are 400 years in four centuries.
15 centuries
100 years = 1 century ⇒ 2500 years = 2500 ÷ 100 centuries = 25 centuries