a decade is ten years. 2 fifths is the same as 4 tenths.4 years
10 years are in one decade
Olympiad = 4 years. Lustrum = 5 years. Decade = 10 Years. Century = 100 Years. Millenium = 1,000 years.
10 years
one decade is 10 years, one decade is 3650 days
One decade is 10 years so 0.1 decade is one year.ten year is said to be a decade.
2.5 years
A decade is Ten Years (This is better than the previous answer)
As we know that a decade is 10 years So, 1 decade = 10 years 4 decades = 4 x 1= = 40 years Thus, 4 decades is equal to 40 years.
4/5
A decade is equal to 10 years. Therefore, one year is one tenth of a decade.
A decade equals 10 years, so to convert 4 billion years to decades, simply divide by 10.4,000,000,000 years / (10 years/ decade) = 400,000,000 decades.So 4 billion years is 400 million decades