If we are to use the precedent set in the previous century (and I do) then the first decade of a century is called the oughts. The year 2009 can also be called twenty ought nine. Slightly archaic, but we don't have any good replacement.
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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.
A Decade with Duke was created on 2009-12-07.
The total days in a decade if the decade starts with a leap year would be 3653. 365 x 10, + 3.
A decade has 10 years in it.
There are 10 years in a decade. Therefore, one year is equal to 1/10 (one tenth) of a decade.