I decade is 10 years, so 100 decades is 1000 years. Each century is 100 years, so 1000 divided by 100 = 10
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260 years equal two centuries and six decades.
There are 10 decades in a century. Therefore, 3.5 centuries is equal to 3.5 x 10 = 35 decades.
5000 = 50*100
Four of them.
50? Reasoning is that: 50 times 10 equal 500.