20 decade
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10 years
1 decade equals 10 years. So 2 decades is equal to 20 years.
1 decade = 10 years
A score is 20 years. A decade is 10 years. So in 10 decades we've had 100 years. Thus there are 5 scores in 10 decades. 10 Years/1 Decade x 10 Decades ÷ 20 years/1 score = 5 scores
2011Because the common calendar starts with year 1, its firstfull decade is the years 1 to 10, the second decade from 11 to 20, and so on. So while the "2000s" comprises the years 2000 to 2009, the "201st decade" spans 2001 to 2010.