|Numeral systems by culture|
|Positional systems by base|
|Non-standard positional numeral systems|
|List of numeral systems|
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.
Each quinary digit has log25 (approx 2.321928094887362) bits of information.
Many languages use quinary number systems, including Gumatj, Nunggubuyu, Kuurn Kopan Noot 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:
|50||200||marrma dambumirri rulu|
|75||300||lurrkun dambumirri rulu|
|100||400||dambumiriw dambumirri rulu|
|125||1000||dambumirri dambumirri rulu|
|625||10000||dambumirri dambumirri dambumirri rulu|
The Chinese and Japanese versions of the abacus use a biquinary system to simulate a decimal system for ease of calculation.
Units of currencies are commonly partially or wholly biquinary.
In the video game Riven and subsequent games of the Myst franchise, the D'ni language uses a quinvigesimal numeral system, in which two sub-bases of 5, with one being a multiplier of the other, are used.
See also 
- Harald Hammarström, Rarities in Numeral Systems: "Bases 5, 10, and 20 are omnipresent." doi:10.1515/9783110220933.11
- Harris, John (1982), "Facts and fallacies of aboriginal number systems", in Hargrave, Susanne, Work Papers of SIL-AAB Series B 8: 153–181
- Dawson, J. "Australian Aborigines: The Languages and Customs of Several Tribes of Aborigines in the Western District of Victoria (1881), p. xcviii.
- Quinary Base Conversion, includes fractional part, from Math Is Fun