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a decade is a period of ten years, while a century is a period of 100 years.

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A decade is a time period of ten years.

Q: What are decades?

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1 decade is 10 years which means 9 decades is 90 years. (10x9) 1 decade= 10 years (10x1) 2 decades= 20 years (10x2) 3 decades= 30 years (10x3) 4 decades= 40 years (10x4) 5 decades= 50 years (10x5) 6 decades= 60 years (10x6) 7 decades= 70 years (10x7) 8 decades= 80 years (10x8) 9 decades= 90 years (10x9) 10 decades= 100 years (10x10)