Not all peoples use
counting, at least not verbally. Specifically, there is not much need for counting among hunter-gatherers who do not engage in commerce. Many languages around the world have no numerals above two to four (if they are actually numerals at all, and not some other part of speech)—or at least did not before contact with the colonial societies—and speakers of these languages may have no tradition of using the numerals they did have for counting. Indeed, several languages from the Amazon have been independently reported to have no specific number words other than 'one'. These include
Nadëb, pre-contact
Mocoví and
Pilagá,
Culina and pre-contact
Jarawara,
Jabutí,
Canela-Krahô,
Botocudo (Krenák),
Chiquitano, the
Campa languages,
Arabela, and
Achuar. Some languages of Australia, such as
Warlpiri, do not have words for quantities above two, and neither did many
Khoisan languages at the time of European contact. Such languages do not have a word class of 'numeral'. Most languages with both numerals and counting use base 8, 10, 12, or 20. Base 10 appears to come from counting one's fingers, base 20 from the fingers and toes, base 8 from counting the spaces between the fingers (attested in California), and base 12 from counting the knuckles (3 each for the four fingers).
No base Many languages of
Melanesia have (or once had) counting systems based on parts of the body which do not have a numeric base; there are (or were) no numerals, but rather nouns for relevant parts of the body—or simply pointing to the relevant spots—were used for quantities. For example, 1–4 may be the fingers, 5 'thumb', 6 'wrist', 7 'elbow', 8 'shoulder', etc., across the body and down the other arm, so that the opposite little finger represents a number between 17 (
Torres Islands) to 23 (
Eleman). For numbers beyond this, the torso, legs and toes may be used, or one might count back up the other arm and back down the first, depending on the people.
2: binary Binary systems are based on the number 2, using zeros and ones. Due to its simplicity, only having two distinct digits, binary is commonly used in computing, with zero and one often corresponding to "off/on" respectively.
3: ternary Ternary systems are based on the number 3, having practical usage in some analog logic, in baseball scoring and in
self–similar mathematical structures.
4: quaternary Quaternary systems are based on the number 4. Some
Austronesian,
Melanesian,
Sulawesi, and
Papua New Guinea ethnic groups, count with the base number four, using the term
asu or
aso, the word for
dog, as the ubiquitous village dog has four legs. This is argued by anthropologists to be also based on early humans noting the human and animal shared body feature of two arms and two legs as well as its ease in simple arithmetic and counting. As an example of the system's ease a realistic scenario could include a farmer returning from the market with fifty
asu heads of pig (200), less 30
asu (120) of pig bartered for 10
asu (40) of goats noting his new pig count total as twenty
asu: 80 pigs remaining. The system has a correlation to the
dozen counting system and is still in common use in these areas as a natural and easy method of simple arithmetic.
5: quinary Quinary systems are based on the number 5. It is almost certain the quinary system developed from counting by fingers (five fingers per hand). An example are the
Epi languages of Vanuatu, where 5 is
luna 'hand', 10
lua-luna 'two hand', 15
tolu-luna 'three hand', etc. 11 is then
lua-luna tai 'two-hand one', and 17
tolu-luna lua 'three-hand two'. 5 is a common
auxiliary base, or
sub-base, where 6 is 'five and one', 7 'five and two', etc.
Aztec was a vigesimal (base-20) system with sub-base 5.
6: senary Senary systems are based on the number 6. The Morehead-Maro languages of Southern New Guinea are examples of the rare base 6 system with monomorphemic words running up to 66. Examples are
Kanum and
Kómnzo. The
Sko languages on the North Coast of New Guinea follow a base-24 system with a sub-base of 6.
7: septenary Septenary systems are based on the number 7. Septenary systems are very rare, as few natural objects consistently have seven distinctive features. Traditionally, it occurs in week-related timing. It has been suggested that the
Palikúr language has a base-seven system, but this is dubious.
8: octal Octal systems are based on the number 8. Examples can be found in the
Yuki language of
California and in the
Pamean languages of
Mexico, because the
Yuki and
Pame keep count by using the four spaces between their fingers rather than the fingers themselves.
9: nonary Nonary systems are based on the number 9. It has been suggested that
Nenets has a base-nine system. There are many regional variations including: • Western system: based on
thousands, with variants (see
English numerals) • Indian system:
crore,
lakh (see
Indian numbering system.
Indian numerals) • East Asian system: based on
ten-thousands (see below)
12: duodecimal Duodecimal systems are based on the number 12. These include: •
Chepang language of
Nepal, •
Mahl language of
Minicoy Island in
India •
Nigerian Middle Belt areas such as
Janji,
Kahugu and the Nimbia dialect of
Gwandara. • reconstructed proto-
Benue–Congo Duodecimal numeric systems have some practical advantages over decimal. It is much easier to divide the base digit
twelve (which is a
highly composite number) by many important
divisors in
market and trade settings, such as the numbers
2,
3,
4 and
6. Because of several measurements based on twelve, many Western languages have words for base-twelve units such as
dozen,
gross and
great gross, which allow for rudimentary duodecimal
nomenclature, such as "two gross six dozen" for 360.
Ancient Romans used a decimal system for
integers, but switched to
duodecimal for
fractions, and correspondingly
Latin developed a rich vocabulary for duodecimal-based fractions (see
Roman numerals). A notable fictional duodecimal system was that of
J. R. R. Tolkien's
Elvish languages, which used duodecimal as well as decimal.
16: hexadecimal Hexadecimal systems are based on the number 16. The traditional
Chinese units of measurement were base-16. For example, one jīn (斤) in the old system equals sixteen
taels. The
suanpan (Chinese
abacus) can be used to perform hexadecimal calculations such as additions and subtractions. South Asian monetary systems were base-16. One rupee in Pakistan and India was divided into 16 annay. A single
anna was subdivided into four
paisa or twelve
pies (thus there were 64 paise or 192 pies in a rupee). The anna was
demonetised as a currency unit when India
decimalised its currency in 1957, followed by Pakistan in 1961.
20: vigesimal Vigesimal systems are based on the number 20. Anthropologists are convinced the system originated from digit counting, as did bases five and ten, twenty being the number of human fingers and toes combined. The system is in widespread use across the world. Some include the classical
Mesoamerican cultures, still in use today in the modern indigenous languages of their descendants, namely the
Nahuatl and
Mayan languages (see
Maya numerals). A modern national language which uses a full vigesimal system is
Dzongkha in Bhutan. Partial vigesimal systems are found in some languages:
Basque,
Celtic languages,
French (from Celtic),
Danish, and
Georgian. In these languages the systems are vigesimal up to 99, then decimal from 100 up. That is, 140 is 'one hundred two score', not *seven score, and there is no numeral for 400 (great score). The term
score originates from
tally sticks, and is perhaps a remnant of Celtic vigesimal counting. It was widely used to learn the pre-decimal British currency in this idiom: "a dozen pence and a
score of
bob", referring to the 20
shillings in a
pound. For Americans the term is most known from the opening of the
Gettysburg Address:
"Four score and seven years ago our fathers...".
24: quadrovigesimal Quadrovigesimal systems are based on the number 24. The
Sko languages have a base-24 system with a sub-base of 6.
32: duotrigesimal Duotrigesimal systems are based on the number 32. The
Ngiti ethnolinguistic group uses a base 32 numeral system.
60: sexagesimal Sexagesimal systems are based on the number 60.
Ekari has a base-60 system.
Sumeria had a base-60 system with a decimal sub-base (with alternating cycles of 10 and 6), which was the origin of the numbering of modern
degrees, minutes, and seconds. {{interlinear|indent=2 799 [i.e. 400 + (4 x 80) + (3 x 20) + {10 + (5 + 4)}]’ ==See also==