Numeral systems by culture  

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Abjad Armenian Āryabhaṭa Cyrillic 
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List of numeral system topics  
Positional systems by base  
Decimal (10)  
1, 2, 3, 4, 5, 8, 12, 16, 20, 60 more…  
Quinary (base5) is a numeral system with five as the base. A possible origination of a quinary system is that there are 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, twentyfive is written as 100 and sixty is written as 220.
As five is a prime number, only the reciprocals of the powers of five terminate, so its location between two composite numbers (4 and 6) does not help make its radix economy better.
Today, the main usage of base 5 is as a biquinary system, which is decimal using five as a subbase. Another example of a subbase system, is sexagesimal, base 60, which used 10 as a subbase.
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Many languages^{[1]} use quinary number systems, including Gumatj, Nunggubuyu,^{[2]}, Kuurn Kopan Noot^{[3]} and Saraveca. Of these, Gumatj is the only true "525" language known, in which 25 is the higher group of 5. The Gumatj numerals are shown below:
Number  Numeral 

1  wanggany 
2  marrma 
3  lurrkun 
4  dambumiriw 
5  wanggany rulu 
10  marrma rulu 
15  lurrkun rulu 
20  dambumiriw rulu 
25  dambumirri rulu 
50  marrma dambumirri rulu 
75  lurrkun dambumirri rulu 
100  dambumiriw dambumirri rulu 
125  dambumirri dambumirri rulu 
625  dambumirri dambumirri dambumirri rulu 
A decimal system with 5 as a subbase is called biquinary, and is found in Wolof and Khmer. A vigesimal system with 5 as a subbase 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.
Units of currencies are commonly partially or wholly biquinary.
