6.5 is one-tenth as much as 65.
One tenth of a dollar is ten cents. One tenth of a dime is one cent.
A penny is one tenth of a dime.
7
One tenth of a centimetre is equal to 1 millimetre.
0.1
4
100,000,000
five
100
One tenth of a carat is a small weight for a diamond -- your local jeweler may have such a diamond to sell.
One tenth = 1/10 = 10/100 = 10 per cent.