Because... there are ten years in a decade - therefore there are ten decades in a century ! The prefix 'dec' means ten.
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10 decades in 1 century
Century
The definition of a decade is 10 years. 8 decades would be 8 x 10 = 80 years.The definition of a century is 100 years.
There are 70 decades in 7 centuries. This is because each century consists of 10 decades, so when you multiply 7 centuries by 10 decades, you get a total of 70 decades.
I'd say about ten decades, or 100 years, or 1 century.