There was no year 0. So the first decade is years 1 thru 10, the first century is years 1 thru 100, and the first millenium is years 1 thru 1000. The first decade of this century/millenium is 2001 thru 2010, and the second decade, which we're still in, is 2011 thru 2020. At least that's my opinion. --ms On 01-Jan-20 12:32, James Propp wrote:
I’ve heard that, “officially”, the 21st century began on January 1, 2001, not January 1, 2000.
Do those officials (whoever they are) also contend that the Aughts (or whatever they’re called) didn’t start until 2001, so that likewise the Teens didn’t start until 2011 and the Twenties won’t start until a year from now? Or do they say that the last year of each century is also the first year of a new decade?
Sorry if I’m resurrecting a thread from ten or twenty years ago...
Jim Propp _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun