A decade is a spell of 10 years - a spell of 100 years is called a century.
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It is 1/10 because a decade is 10 years and a century is 100 years
decade
1 decade = 10 years ⇒ 10 decades = 10 x 10 years = 100 years 1000 years = 1 millennium ⇒ 10 decades = 100 years = 100 ÷ 1000 millennium = 1/10 millennium = 0.1 millennium
No a decade is 10 years, a century 100.
1 Decade = 10 Years 1000 / 10 = 100 Answer: 100 Decades