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A decade is 10 years, and a millenium is 1000 years, therefore the answer is 100 decades = 1 millennium.
Well honey, 1000 years is 10 decades. Simple math, darling. Just take the number of years and divide it by 100, and voila! You've got your answer.
There are ten decades in a millennium. A decade is a period of ten years, and a millennium is a period of one thousand years. Therefore, a millennium consists of ten decades.
100 of them because a decade is 10 years and a millennium is a 1000 years