There are 30 centuries in 3 millennia. A millennium consists of 1000 years, and a century consists of 100 years. Therefore, to find the number of centuries in 3 millennia, you would multiply 3 (millennia) by 10 (centuries in a millennium), which equals 30 centuries.
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2000/100 = 20 centuries
1 millennium = 1,000 years so 3 millennia = 3,000 years. Simple!
5000000
A thousand years
1 millennium = 1000 years 2 millennia = 2000 years