There are 100 years in each millennial. There are 10 decades in each 100 years. 100 x 8 = 800 X 10 = 8,000.
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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.
Four score years, or eight decades.
3.154x10^8 seconds
A decade is 10 years therefore 8 decades is 80 years.
1 decade = 10 years. 10x8 = 80.