One thousand
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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
1 millennium = 1000 years 1 century = 100 years → 10 centuries = 10 x 100 years = 1000 years → 1 millennium is neither bigger nor smaller than 10 centuries - 1 millennium is the same as 10 centuries.
1 millennium = 1000 years 2 millennia = 2000 years
1 millennium = 1,000 years so 3 millennia = 3,000 years. Simple!
1 decade equals 10 years.