# Decimal

Updated: 04/26/2017 by Computer Hope

Alternatively referred to as **base 10**, **decimal** is a numbering system comprised of the numerals 0 to 9 that was first used by the Chinese in 1350 B.C..

## Decimal fractions

A decimal fraction is a fraction with a denominator of a power of ten, determined by the number of digits to the right of the **decimal point** or **decimal separator**. For example, 2/10, 2/100, and 2/1000 are expressed in decimal as 0.2, 0.02, and 0.002.