Quinary

In the quinary place system, five numerals, from 0 to 4, are used to represent any real number.

Many languages[4] use quinary number systems, including Gumatj, Nunggubuyu,[5] Kuurn Kopan Noot,[6] Luiseño,[7] and Saraveca.

The Gumatj numerals are shown below:[5] However, Harald Hammarström reports that "one would not usually use exact numbers for counting this high in this language and there is a certain likelihood that the system was extended this high only at the time of elicitation with one single speaker," pointing to the Biwat language as a similar case (previously attested as 5-20, but with one speaker recorded as making an innovation to turn it 5-25).

[4] A decimal system with two and five as a sub-bases is called biquinary and is found in Wolof and Khmer.

Urnfield culture numerals and some tally mark systems are also biquinary.