There are 3.5 decades in 35 years
60 years = 6 decades.
4 decades, 4 years
Twenty decades = 200 years
There are 20 years in two decades.
45 years
A decade is ten years. Half a decade is five years.Therefore. four decades are forty years, plus the five years, totalling forty-five years (45 years).
4.5 decades equals 4.5 decades!
No, you don't need a hyphen. It would be 10 decades or ten decades.
100 decades in a millennium
There are 3.5 decades in 35 years
30 decades
There are 10.6 decades. Or 10 decades plus 6 years.
16.7 decades
There are 20 decades.
fifty decades
70 decades