17 centuries.
From the last day of the 9th century BCE to the first day of the 9th century AD was just over 1600 years while
From the first day of the 9th century BCE to the last day of the 9th century AD was just under 1800 years.
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Decade = 10 years Century = 100 years
80 years. Century = 100 years Score = 20 years
The twelfth century covers the years between 1101 and 1200.
Since there are 100 years in a century, subtract 100 from 2011: 1911.
2900