quinary
Quinary (base-) is a numeral system with five as the base. This originates from the five fingers on either hand.
In the quinary place system, five numerals from 0 to 4, are used to represent any real number. According to this method, five is written as 10, twenty-five is written as 100 and sixty is written as 220.
Usage
Many languages[Harald Hammarström, Rarities in Numeral Systems: "Bases 5, 10, and 20 are omnipresent."] use quinary number systems, including Gumatj, Nunggubuyu,[Dawson, J. "Australian Aborigines: The Languages and Customs of Several Tribes of Aborigines in the Western District of Victoria (1881), p. xcviii.] and Saraveca. Of these, Gumatj is the only true "5-25" language known, in which 25 is the higher group of 5. The Gumatj numerals are shown below:
A decimal system with 5 as a sub-base is called biquinary, and is found in Wolof and Khmer. A vigesimal system with 5 as a sub-base is found in Nahuatl and the Maya numerals.
Roman numerals are a biquinary system. The numbers 1, 5, 10, and 50 are written as I, V, X, and L respectively. Eight is VIII and seventy is LXX.
The Chinese and Japanese versions of the abacus use a biquinary system to simulate a decimal system for ease of calculation.
Urnfield culture numerals and some tally mark systems are also biquinary.
See also
 Pentimal system
External links
Quinary Base Conversion, includes fractional part, from Math Is Fun
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