As a fraction it is 1/10 or 0.1 as a decimal
Yes, one fifth and one tenth are fractions.
1/10
three and one tenth
They are equivalent fractions, each equal to 0.2
Equal
The prefix "deci-" is used to express fractions in the metric system, representing one-tenth of the base unit.
There is no special name for such fractions.
There is a 'decimetre' - which is a measurement of length, one tenth of a metre. If that's what you meant.
0.1 = 1/10 (one tenth) 2/20 (two twentieths)
1/5
One tenth of a centimeter is equal to 0.1 centimeters. This can also be expressed as 1 millimeter, as there are 10 millimeters in a centimeter. In terms of comparison, it is relatively small, as it is one-tenth of the base unit of measurement for length in the metric system.
"dl" is a metric measurement meaning "deciliter" or one-tenth of a liter.