Decimal fraction
A decimal fraction is a fractional number with a denominator of ten or a power of ten. Common fractions, percents, and decimal fractions are all ways of expressing fractional numbers.
Examples  
Each of the placevalue charts in the figure below shows a decimal fraction. A decimal fraction is usually written with a decimal point. It can also be expressed as a common fraction with a denominator of ten or a power of ten.  

Also called decimal.
See also decimal numeration system.