100 of them because a decade is 10 years and a millennium is a 1000 years
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A decade is 10 years, so 6 decades is 60 years.
8 decades are equal to 80 years. A decade consists of a period of 10 years, so when you multiply 8 by 10, you get 80. Therefore, 8 decades equal 80 years.
1 decade equals 10 years. So 2 decades is equal to 20 years.
There are 10 years in one decade. Therefore, 164 years is equal to 164 / 10 = 16.4 decades.
equal