Four score years, or eight decades.
8
There are two fifths in four tenths.
One is five fifths. Five fifths and four fifths is nine fifths.
Its 10. 10 decades = 1 century.
10 decades in 1 century
There are 20 decades.
There are 5 decades in half a century.
Learn your math...JK 6 and four fifths is written like so: 6.4 so two fifths.
There are two fifths in four tenths.
There are 4......
Ten
Ten decades is one century.
If you mean 3/10 of a century then there are 3 decades A decade is 10 years and a century is 100 years