10
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1 decade = 10 years 10 decades = 100 years 100 years = 1 century
1000
Ten decades equals 100 years or one century.
There are 100 years in each millennial. There are 10 decades in each 100 years. 100 x 8 = 800 X 10 = 8,000.
A decade is 10 years, and a millenium is 1000 years, therefore the answer is 100 decades = 1 millennium.