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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.
years...or 10, 100,1000
In 2010. To prove it, look at the eighties: 1980-1989. So the second decade of the twenty-first century is from 2010-2019.
That's the year 301.
No, a decade is every ten years, a century is every 100.