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.
Ten
Ten decades is one century.
i know
10 of them.
four fifths is equal to eight tenths 4/5 = 8/10