There are 500/10 = 50 decades
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210
A decade is 10 years and so 40 times 10 = 400 years which is 4 centuries
5 years. A decade means 10 years, so to find out how many years are in half of a decade you would simply divide 10 by 2, which is 5.
a decade is ten years, a century is one hundred years. one hundred times three is three hundred. three hundred divided by ten equals thirty
By increments of 10 years called a 'decade'.