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A decade is 10 years. 2012 is one year. There are no decades in a single year. The years 2002 - 2012 represents a decade.
One decade is ten years. That means that 511 decades would be 5110 years, or 511x10. One year has 365 days, and every fourth year is a leap year, so 511 decades would be 1866427 days.
One decade = 10 years. 49 decades = 490 years. There are 52 weeks in one year: 490 x 52 = 25480 weeks in 49 decades
There are 12 decades in a 120 year period.
If one year has 12 months, then a decade would have 120. And two decades would be the double of that, so 240
Ten
30 years
20
Ten decades is one century.
100 decades are in one thousand years.
3 decades = 3 x 10 = 30 years
If there are 12 months in one year, and a decade is 10 years. Then there are 120 months in a decade. (12x10=120)