Numeral (linguistics)

Last updated August 31, 2024

In linguistics, a numeral in the broadest sense is a word or phrase that describes a numerical quantity. Some theories of grammar use the word "numeral" to refer to cardinal numbers that act as a determiner that specify the quantity of a noun, for example the "two" in "two hats". Some theories of grammar do not include determiners as a part of speech and consider "two" in this example to be an adjective. Some theories consider "numeral" to be a synonym for "number" and assign all numbers (including ordinal numbers like "first") to a part of speech called "numerals".^[1]^[2] Numerals in the broad sense can also be analyzed as a noun ("three is a small number"), as a pronoun ("the two went to town"), or for a small number of words as an adverb ("I rode the slide twice").

Identifying numerals

Numerals may be attributive, as in two dogs, or pronominal, as in I saw two (of them).

Many words of different parts of speech indicate number or quantity. Such words are called quantifiers. Examples are words such as every, most, least, some, etc. Numerals are distinguished from other quantifiers by the fact that they designate a specific number.^[3] Examples are words such as five, ten, fifty, one hundred, etc. They may or may not be treated as a distinct part of speech; this may vary, not only with the language, but with the choice of word. For example, "dozen" serves the function of a noun, "first" serves the function of an adjective, and "twice" serves the function of an adverb. In Old Church Slavonic, the cardinal numbers 5 to 10 were feminine nouns; when quantifying a noun, that noun was declined in the genitive plural like other nouns that followed a noun of quantity (one would say the equivalent of "five of people"). In English grammar, the classification "numeral" (viewed as a part of speech) is reserved for those words which have distinct grammatical behavior: when a numeral modifies a noun, it may replace the article: the/some dogs played in the park → twelve dogs played in the park. (*dozen dogs played in the park is not grammatical, so "dozen" is not a numeral in this sense.) English numerals indicate cardinal numbers. However, not all words for cardinal numbers are necessarily numerals. For example, million is grammatically a noun, and must be preceded by an article or numeral itself.

Numerals may be simple, such as 'eleven', or compound, such as 'twenty-three'.

In linguistics, however, numerals are classified according to purpose: examples are ordinal numbers (first, second, third, etc.; from 'third' up, these are also used for fractions), multiplicative (adverbial) numbers (once, twice, and thrice), multipliers (single, double, and triple), and distributive numbers (singly, doubly, and triply). Georgian,^[4] Latin, and Romanian (see Romanian distributive numbers) have regular distributive numbers, such as Latin singuli "one-by-one", bini "in pairs, two-by-two", terni "three each", etc. In languages other than English, there may be other kinds of number words. For example, in Slavic languages there are collective numbers (monad, pair/dyad, triad) which describe sets, such as pair or dozen in English (see Russian numerals, Polish numerals).

Some languages have a very limited set of numerals, and in some cases they arguably do not have any numerals at all, but instead use more generic quantifiers, such as 'pair' or 'many'. However, by now most such languages have borrowed the numeral system or part of the numeral system of a national or colonial language, though in a few cases (such as Guarani ^[5]), a numeral system has been invented internally rather than borrowed. Other languages had an indigenous system but borrowed a second set of numerals anyway. An example is Japanese, which uses either native or Chinese-derived numerals depending on what is being counted.

In many languages, such as Chinese, numerals require the use of numeral classifiers. Many sign languages, such as ASL, incorporate numerals.

Larger numerals

English has derived numerals for multiples of its base (fifty, sixty, etc.), and some languages have simplex numerals for these, or even for numbers between the multiples of its base. Balinese, for example, currently has a decimal system, with words for 10, 100, and 1000, but has additional simplex numerals for 25 (with a second word for 25 only found in a compound for 75), 35, 45, 50, 150, 175, 200 (with a second found in a compound for 1200), 400, 900, and 1600. In Hindustani, the numerals between 10 and 100 have developed to the extent that they need to be learned independently.

In many languages, numerals up to the base are a distinct part of speech, while the words for powers of the base belong to one of the other word classes. In English, these higher words are hundred 10², thousand 10³, million 10⁶, and higher powers of a thousand (short scale) or of a million (long scale—see names of large numbers). These words cannot modify a noun without being preceded by an article or numeral (*hundred dogs played in the park), and so are nouns.

In East Asia, the higher units are hundred, thousand, myriad 10⁴, and powers of myriad. In the Indian subcontinent, they are hundred, thousand, lakh 10⁵, crore 10⁷, and so on. The Mesoamerican system, still used to some extent in Mayan languages, was based on powers of 20: bak’ 400 (20²), pik 8000 (20³), kalab 160,000 (20⁴), etc.

Numerals of cardinal numbers

The cardinal numbers have numerals. In the following tables, [and] indicates that the word and is used in some dialects (such as British English), and omitted in other dialects (such as American English).

This table demonstrates the standard English construction of some cardinal numbers. (See next table for names of larger cardinals.)

Value	Name	Alternate names, and names for sets of the given size
0	Zero	aught, cipher, cypher, donut, dot, duck, goose egg, love, nada, naught, nil, none, nought, nowt, null, ought, oh, squat, zed, zilch, zip, zippo
1	One	ace, individual, single, singleton, unary, unit, unity
2	Two	binary, brace, couple, couplet, distich, deuce, double, doubleton, duad, duality, duet, duo, dyad, pair, span, twain, twin, twosome, yoke
3	Three	deuce-ace, leash, set, tercet, ternary, ternion, terzetto, threesome, tierce, trey, triad, trine, trinity, trio, triplet, troika, hat-trick
4	Four	foursome, quadruplet, quatern, quaternary, quaternity, quartet, tetrad
5	Five	cinque, fin, fivesome, pentad, quint, quintet, quintuplet
6	Six	half dozen, hexad, sestet, sextet, sextuplet, sise
7	Seven	heptad, septet, septuple, walking stick
8	Eight	octad, octave, octet, octonary, octuplet, ogdoad
9	Nine	ennead
10	Ten	deca, decade, das (India)
11	Eleven	onze, ounze, ounce, banker's dozen
12	Twelve	dozen
13	Thirteen	baker's dozen, long dozen^[6]
20	Twenty	score,
21	Twenty-one	long score,^[6] blackjack
22	Twenty-two	Deuce-deuce
24	Twenty-four	two dozen
40	Forty	two-score
50	Fifty	half-century
55	Fifty-five	double nickel
60	Sixty	three-score
70	Seventy	three-score and ten
80	Eighty	four-score
87	Eighty-seven	four-score and seven
90	Ninety	four-score and ten
100	One hundred	centred, century, ton, short hundred
111	One hundred [and] eleven	eleventy-one^[7]
120	One hundred [and] twenty	long hundred,^[6] great hundred, (obsolete) hundred
144	One hundred [and] forty-four	gross, dozen dozen, small gross
1000	One thousand	chiliad, grand, G, thou, yard, kilo, k, millennium, Hajaar (India), ten hundred
1024	One thousand [and] twenty-four	kibi or kilo in computing, see binary prefix (kilo is shortened to K, Kibi to Ki)
1100	One thousand one hundred	Eleven hundred
1728	One thousand seven hundred [and] twenty-eight	great gross, long gross, dozen gross
10000	Ten thousand	myriad, wan (China)
100000	One hundred thousand	lakh
500000	Five hundred thousand	crore (Iranian)
1000000	One million	Mega, meg, mil, (often shortened to M)
1048576	One million forty-eight thousand five hundred [and] seventy-six	Mibi or Mega in computing, see binary prefix (Mega is shortened to M, Mibi to Mi)
10000000	Ten million	crore (Indian)(Pakistan)
100000000	One hundred million	yi (China)

English names for powers of 10

This table compares the English names of cardinal numbers according to various American, British, and Continental European conventions. See English numerals or names of large numbers for more information on naming numbers.

	Short scale	Long scale
Value	American	British (Nicolas Chuquet)	Continental European (Jacques Peletier du Mans)
10⁰	One
10¹	Ten
10²	Hundred
10³	Thousand
10⁶	Million
10⁹	Billion	Thousand million	Milliard
10¹²	Trillion	Billion
10¹⁵	Quadrillion	Thousand billion	Billiard
10¹⁸	Quintillion	Trillion
10²¹	Sextillion	Thousand trillion	Trilliard
10²⁴	Septillion	Quadrillion
10²⁷	Octillion	Thousand quadrillion	Quadrilliard
10³⁰	Nonillion	Quintillion
10³³	Decillion	Thousand quintillion	Quintilliard
10³⁶	Undecillion	Sextillion
10³⁹	Duodecillion	Thousand sextillion	Sextilliard
10⁴²	Tredecillion	Septillion
10⁴⁵	Quattuordecillion	Thousand septillion	Septilliard
10⁴⁸	Quindecillion	Octillion
10⁵¹	Sexdecillion	Thousand octillion	Octilliard
10⁵⁴	Septendecillion	Nonillion
10⁵⁷	Octodecillion	Thousand nonillion	Nonilliard
10⁶⁰	Novemdecillion	Decillion
10⁶³	Vigintillion	Thousand decillion	Decilliard
10⁶⁶	Unvigintillion	Undecillion
10⁶⁹	Duovigintillion	Thousand undecillion	Undecilliard
10⁷²	Trevigintillion	Duodecillion
10⁷⁵	Quattuorvigintillion	Thousand duodecillion	Duodecilliard
10⁷⁸	Quinvigintillion	Tredecillion
10⁸¹	Sexvigintillion	Thousand tredecillion	Tredecilliard
10⁸⁴	Septenvigintillion	Quattuordecillion
10⁸⁷	Octovigintillion	Thousand quattuordecillion	Quattuordecilliard
10⁹⁰	Novemvigintillion	Quindecillion
10⁹³	Trigintillion	Thousand quindecillion	Quindecilliard
10⁹⁶	Untrigintillion	Sexdecillion
10⁹⁹	Duotrigintillion	Thousand sexdecillion	Sexdecilliard
10¹²⁰	Novemtrigintillion	Vigintillion
10¹²³	Quadragintillion	Thousand vigintillion	Vigintilliard
10¹⁵³	Quinquagintillion	Thousand quinvigintillion	Quinvigintilliard
10¹⁸⁰	Novemquinquagintillion	Trigintillion
10¹⁸³	Sexagintillion	Thousand trigintillion	Trigintilliard
10²¹³	Septuagintillion	Thousand quintrigintillion	Quintrigintilliard
10²⁴⁰	Novemseptuagintillion	Quadragintillion
10²⁴³	Octogintillion	Thousand quadragintillion	Quadragintilliard
10²⁷³	Nonagintillion	Thousand quinquadragintillion	Quinquadragintilliard
10³⁰⁰	Novemnonagintillion	Quinquagintillion
10³⁰³	Centillion	Thousand quinquagintillion	Quinquagintilliard
10³⁶⁰	Cennovemdecillion	Sexagintillion
10⁴²⁰	Cennovemtrigintillion	Septuagintillion
10⁴⁸⁰	Cennovemquinquagintillion	Octogintillion
10⁵⁴⁰	Cennovemseptuagintillion	Nonagintillion
10⁶⁰⁰	Cennovemnonagintillion	Centillion
10⁶⁰³	Ducentillion	Thousand centillion	Centilliard

There is no consistent and widely accepted way to extend cardinals beyond centillion (centilliard).

Myriad, Octad, and -yllion systems

The following table details the myriad, octad, Ancient Greek Archimedes's notation, Chinese myriad, Chinese long and -yllion names for powers of 10.

There is also a Knuth-proposed system notation of numbers, named the -yllion system.^[8] In this system, a new word is invented for every 2ⁿ-th power of ten.

Value	Myriad System Name	Octad System Name	Ancient Greek Myriad Scale	Chinese Myriad Scale	Chinese Long Scale	Knuth-proposed System Name
10⁰	One	One	εἷς (heîs)	一	一	One
10¹	Ten	Ten	δέκα (déka)	十	十	Ten
10²	Hundred	Hundred	ἑκατόν (hekatón)	百	百	Hundred
10³	Thousand	Thousand	χίλιοι (khī́lioi)	千	千	Ten hundred
10⁴	Myriad	Myriad	μύριοι (mýrioi)	萬 ( 万 )	萬 ( 万 )	Myriad
10⁵	Ten myriad	Ten myriad	δεκάκις μύριοι (dekákis mýrioi)	十萬 (十万)	十萬 (十万)	Ten myriad
10⁶	Hundred myriad	Hundred myriad	ἑκατοντάκις μύριοι (hekatontákis mýrioi)	百萬 (百万)	百萬 (百万)	Hundred myriad
10⁷	Thousand myriad	Thousand myriad	χιλιάκις μύριοι (khiliákis mýrioi)	千萬 (千万)	千萬 (千万)	Ten hundred myriad
10⁸	Second myriad	Octad	μυριάκις μύριοι (muriákis mýrioi)	億 ( 亿 )	億 ( 亿 )	Myllion
10⁹	Ten second myriad	Ten octad	δεκάκις μυριάκις μύριοι (dekákis muriákis múrioi)	十億 (十亿)	十億 (十亿)	Ten myllion
10¹⁰	Hundred second myriad	Hundred octad	ἑκατοντάκις μυριάκις μύριοι (hekatontákis muriákis múrioi)	百億 (百亿)	百億 (百亿)	Hundred myllion
10¹¹	Thousand second myriad	Thousand octad	χῑλῐάκῐς μυριάκις μύριοι (khīliákis muriákis múrioi)	千億 (千亿)	千億 (千亿)	Ten hundred myllion
10¹²	Third myriad	Myriad octad	μυριάκις μυριάκις μύριοι (muriákis muriákis mýrioi)	兆	萬億 (万亿)	Myriad myllion
10¹³	Ten third myriad	Ten myriad octad	δεκάκις μυριάκις μυριάκις μύριοι (dekákis muriákis muriákis mýrioi)	十兆	十萬億 (十万亿)	Ten myriad myllion
10¹⁴	Hundred third myriad	Hundred myriad octad	ἑκατοντάκις μυριάκις μυριάκις μύριοι (hekatontákis muriákis muriákis mýrioi)	百兆	百萬億 (百万亿)	Hundred myriad myllion
10¹⁵	Thousand third myriad	Thousand myriad octad	χιλιάκις μυριάκις μυριάκις μύριοι (khiliákis muriákis muriákis mýrioi)	千兆	千萬億 (千万亿)	Ten hundred myriad myllion
10¹⁶	Fourth myriad	Second octad	μυριάκις μυριάκις μυριάκις μύριοι (muriákis muriákis muriákis mýrioi)	京	兆	Byllion
10¹⁷	Ten fourth myriad	Ten second octad	δεκάκις μυριάκις μυριάκις μυριάκις μύριοι (dekákis muriákis muriákis muriákis mýrioi)	十京	十兆	Ten byllion
10¹⁸	Hundred fourth myriad	Hundred second octad	ἑκατοντάκις μυριάκις μυριάκις μυριάκις μύριοι (hekatontákis muriákis muriákis muriákis mýrioi)	百京	百兆	Hundred byllion
10¹⁹	Thousand fourth myriad	Thousand second octad	χιλιάκις μυριάκις μυριάκις μυριάκις μύριοι (khiliákis muriákis muriákis muriákis mýrioi)	千京	千兆	Ten hundred byllion
10²⁰	Fifth myriad	Myriad second octad	μυριάκις μυριάκις μυριάκις μυριάκις μύριοι (muriákis muriákis muriákis muriákis mýrioi)	垓	萬兆	Myriad byllion
10²¹	Ten fifth myriad	Ten myriad second octad	δεκάκις μυριάκις μυριάκις μυριάκις μυριάκις μύριοι (dekákis muriákis muriákis muriákis muriákis mýrioi)	十垓	十萬兆	Ten myriad byllion
10²²	Hundred fifth myriad	Hundred myriad second octad	ἑκατοντάκις μυριάκις μυριάκις μυριάκις μυριάκις μύριοι (hekatontákis muriákis muriákis muriákis muriákis mýrioi)	百垓	百萬兆	Hundred myriad byllion
10²³	Thousand fifth myriad	Thousand myriad second octad	χιλιάκις μυριάκις μυριάκις μυριάκις μυριάκις μύριοι (khiliákis muriákis muriákis muriákis muriákis mýrioi)	千垓	千萬兆	Ten hundred myriad byllion
10²⁴	Sixth myriad	Third octad	μυριάκις μυριάκις μυριάκις μυριάκις μυριάκις μύριοι (muriákis muriákis muriákis muriákis muriákis mýrioi)	秭 (in China); 𥝱 (in Japan)	億兆	Myllion byllion
10²⁸	Seventh myriad	Myriad third octad		穰	萬億兆	Myriad myllion byllion
10³²	Eighth myriad	Fourth octad		溝 ( 沟 )	京	Tryllion
10³⁶	Ninth myriad	Myriad fourth octad		澗 ( 涧 )	萬京	Myriad tryllion
10⁴⁰	Tenth myriad	Fifth octad		正	億京	Myllion tryllion
10⁴⁴	Eleventh myriad	Myriad fifth octad		載 ( 载 )	萬億京	Myriad myllion tryllion
10⁴⁸	Twelfth myriad	Sixth octad		極 ( 极 ) (in China and in Japan)	兆京	Byllion tryllion
10⁵²	Thirteenth myriad	Myriad sixth octad		恆河沙 ( 恒河沙 ) (in China)	萬兆京	Myriad byllion tryllion
10⁵⁶	Fourteenth myriad	Seventh octad		阿僧祇 (in China); 恒河沙 (in Japan)	億兆京	Myllion byllion tryllion
10⁶⁰	Fifteenth myriad	Myriad seventh octad		那由他 , 那由多 (in China)	萬億兆京	Myriad myllion byllion tryllion
10⁶⁴	Sixteenth myriad	Eighth octad		不可思議 ( 不可思议 ) (in China), 阿僧祇 (in Japan)	垓	Quadyllion
10⁶⁸	Seventeenth myriad	Myriad eighth octad		無量大數 ( 无量大数 ) (in China)	萬垓	Myriad quadyllion
10⁷²	Eighteenth myriad	Ninth octad		那由他 , 那由多 (in Japan)	億垓	Myllion quadyllion
10⁸⁰	Twentieth myriad	Tenth octad		不可思議 (in Japan)	兆垓	Byllion quadyllion
10⁸⁸	Twenty-second myriad	Eleventh octad		無量大数 (in Japan)	億兆垓	Myllion byllion quadyllion
10¹²⁸	Thirty-second myriad	Sixteenth octad			秭	Quinyllion
10²⁵⁶	Sixty-fourth myriad	Thirty-second octad			穰	Sexyllion
10⁵¹²	128th myriad	Sixty-fourth octad			溝 ( 沟 )	Septyllion
10^1,024	256th myriad	128th octad			澗 ( 涧 )	Octyllion
10^2,048	512th myriad	256th octad			正	Nonyllion
10^4,096	1024th myriad	512th octad			載 ( 载 )	Decyllion
10^8,192	2048th myriad	1024th octad			極 ( 极 )	Undecyllion
10^16,384	4096th myriad	2048th octad			恆河沙 ( 恒河沙 )	Duodecyllion
10^32,768	8192nd myriad	4096th octad			阿僧祇	Tredecyllion
10^65,536	16384th myriad	8192nd octad			那由他 , 那由多	Quattuordecyllion
10^131,072	32768th myriad	16384th octad			不可思議 ( 不可思议 )	Quindecyllion
10^262,144	65536th myriad	32768th octad			無量大數 ( 无量大数 )	Sexdecyllion
10^524,288	131072nd myriad	65536th octad				Septendecyllion
10^1,048,576	262144th myriad	131072nd octad				Octodecyllion
10^2,097,152	524288th myriad	262144th octad				Novemdecyllion
10^4,194,304	1048576th myriad	524288th octad				Vigintyllion
10^2³²	1073741824th myriad	536870912nd octad				Trigintyllion
10^2⁴²	1099511627776th myriad	549755813888th octad				Quadragintyllion
10^2⁵²						Quinquagintyllion
10^2⁶²						Sexagintyllion
10^2⁷²						Septuagintyllion
10^2⁸²						Octogintyllion
10^2⁹²						Nonagintyllion
10^2¹⁰²						Centyllion
10^{2^1,002}						Millyllion
10^{2^10,002}						Myryllion

Fractional numerals

This is a table of English names for non-negative rational numbers less than or equal to 1. It also lists alternative names, but there is no widespread convention for the names of extremely small positive numbers.

Keep in mind that rational numbers like 0.12 can be represented in infinitely many ways, e.g. zero-point-one-two (0.12), twelve percent (12%), three twenty-fifths (⁠3/25⁠), nine seventy-fifths (⁠9/75⁠), six fiftieths (⁠6/50⁠), twelve hundredths (⁠12/100⁠), twenty-four two-hundredths (⁠24/200⁠), etc.

Value	Fraction	Common names
1	⁠1/1⁠	One, Unity, Whole
0.9	⁠9/10⁠	Nine tenths, [zero] point nine
0.833333...	⁠5/6⁠	Five sixths
0.8	⁠4/5⁠	Four fifths, eight tenths, [zero] point eight
0.75	⁠3/4⁠	three quarters, three fourths, seventy-five hundredths, [zero] point seven five
0.7	⁠7/10⁠	Seven tenths, [zero] point seven
0.666666...	⁠2/3⁠	Two thirds
0.6	⁠3/5⁠	Three fifths, six tenths, [zero] point six
0.5	⁠1/2⁠	One half, five tenths, [zero] point five
0.4	⁠2/5⁠	Two fifths, four tenths, [zero] point four
0.333333...	⁠1/3⁠	One third
0.3	⁠3/10⁠	Three tenths, [zero] point three
0.25	⁠1/4⁠	One quarter, one fourth, twenty-five hundredths, [zero] point two five
0.2	⁠1/5⁠	One fifth, two tenths, [zero] point two
0.166666...	⁠1/6⁠	One sixth
0.142857142857...	⁠1/7⁠	One seventh
0.125	⁠1/8⁠	One eighth, one-hundred-[and-]twenty-five thousandths, [zero] point one two five
0.111111...	⁠1/9⁠	One ninth
0.1	⁠1/10⁠	One tenth, [zero] point one, One perdecime, one perdime
0.090909...	⁠1/11⁠	One eleventh
0.09	⁠9/100⁠	Nine hundredths, [zero] point zero nine
0.083333...	⁠1/12⁠	One twelfth
0.08	⁠2/25⁠	Two twenty-fifths, eight hundredths, [zero] point zero eight
0.076923076923...	⁠1/13⁠	One thirteenth
0.071428571428...	⁠1/14⁠	One fourteenth
0.066666...	⁠1/15⁠	One fifteenth
0.0625	⁠1/16⁠	One sixteenth, six-hundred-[and-]twenty-five ten-thousandths, [zero] point zero six two five
0.055555...	⁠1/18⁠	One eighteenth
0.05	⁠1/20⁠	One twentieth, five hundredths, [zero] point zero five
0.047619047619...	⁠1/21⁠	One twenty-first
0.045454545...	⁠1/22⁠	One twenty-second
0.043478260869565217391304347...	⁠1/23⁠	One twenty-third
0.041666...	⁠1/24⁠	One twenty-fourth
0.04	⁠1/25⁠	One twenty-fifth, four hundredths, [zero] point zero four
0.033333...	⁠1/30⁠	One thirtieth
0.03125	⁠1/32⁠	One thirty-second, thirty one-hundred [and] twenty five hundred-thousandths, [zero] point zero three one two five
0.03	⁠3/100⁠	Three hundredths, [zero] point zero three
0.025	⁠1/40⁠	One fortieth, twenty-five thousandths, [zero] point zero two five
0.02	⁠1/50⁠	One fiftieth, two hundredths, [zero] point zero two
0.016666...	⁠1/60⁠	One sixtieth
0.015625	⁠1/64⁠	One sixty-fourth, ten thousand fifty six-hundred [and] twenty-five millionths, [zero] point zero one five six two five
0.012345679012345679...	⁠1/81⁠	One eighty-first
0.010101...	⁠1/99⁠	One ninety-ninth
0.01	⁠1/100⁠	One hundredth, [zero] point zero one, One percent
0.009900990099...	⁠1/101⁠	One hundred-first
0.008264462809917355371900...	⁠1/121⁠	One over one hundred twenty-one
0.001	⁠1/1000⁠	One thousandth, [zero] point zero zero one, One permille
0.000277777...	⁠1/3600⁠	One thirty-six hundredth
0.0001	⁠1/10000⁠	One ten-thousandth, [zero] point zero zero zero one, One myriadth, one permyria, one permyriad, one basis point
0.00001	⁠1/100000⁠	One hundred-thousandth, [zero] point zero zero zero zero one, One lakhth, one perlakh
0.000001	⁠1/1000000⁠	One millionth, [zero] point zero zero zero zero zero one, One ppm
0.0000001	⁠1/10000000⁠	One ten-millionth, One crorth, one percrore
0.00000001	⁠1/100000000⁠	One hundred-millionth
0.000000001	⁠1/1000000000⁠	One billionth (in some dialects), One ppb
0.000000000001	⁠1/1000000000000⁠	One trillionth, One ppt
0	⁠0/1⁠	Zero, Nil

Other specific quantity terms

Various terms have arisen to describe commonly used measured quantities.

Unit: 1 (based on a single entity of counting or measurement of an object or item)
Pair: 2 (the base of the binary numeral system)
Leash: 3 (the base of the trinary numeral system)
Dozen: 12 (the base of the duodecimal numeral system)
Baker's dozen: 13 (based on a group of thirteen objects or items)
Score: 20 (the base of the vigesimal numeral system)
Shock: 60 (the base of the sexagesimal numeral system)^[9]
Gross: (based on a group of 144 objects or items)
Great gross: (based on a group of 1,728 objects or items)

Basis of counting system

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.^[10] Some languages of Australia, such as Warlpiri, do not have words for quantities above two,^[11]^[12]^[13] 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).^[14]

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.^{[ citation needed ]}

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.^[15] 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.^[15]^[16]

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).^[17] 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.^[18]

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.^[19]

9: nonary

Nonary systems are based on the number 9. It has been suggested that Nenets has a base-nine system.^[18]

10: decimal

Decimal systems are based on the number 10. A majority of traditional number systems are decimal. This dates back at least to the ancient Egyptians, who used a wholly decimal system. Anthropologists hypothesize this may be due to humans having five digits per hand, ten in total.^[17]^[20] 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.
Melanesia ^{[ citation needed ]}
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,^[21] 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.^[22]

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.^[17]^[23] 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 European 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.

80: octogesimal

Octogesimal systems are based on the number 80. Supyire is said to have a base-80 system; it counts in twenties (with 5 and 10 as sub-bases) up to 80, then by eighties up to 400, and then by 400s (great scores).

kàmpwóò

four hundred

ŋ̀kwuu

eighty

sicyɛɛré

four

ná

and

béé-tàànre

twenty-three

ná

and

kɛ́

ten

ná

and

báár-ìcyɛ̀ɛ̀rè

five-four

799 [i.e. 400 + (4 x 80) + (3 x 20) + {10 + (5 + 4)}]’

↑ Charles Follen: A Practical Grammar of the German Language. Boston, 1828, p. 9, p. 44 and 48. Quote: "PARTS OF SPEECH. There are ten parts of speech, viz. Article, Substantive or Noun, Adjective, Numeral, Pronoun, Verb, Adverb, Preposition, Conjunction, and Interjection.", "NUMERALS. The numbers are divided into cardinal, ordinal, proportional, distributive, and collective. [...] Numerals of proportion and distribution are [...] &c. Observation. The above numerals, in fach or fäl´tig, are regularly declined, like other adjectives."
↑ Horace Dalmolin: The New English Grammar: With Phonetics, Morphology and Syntax, Tate Publishing & Enterprises, 2009, p. 175 & p. 177. Quote: "76. The different types of words used to compose a sentence, in order to relate an idea or to convey a thought, are known as parts of speech. [...] The parts of speech, with a brief definition, will follow. [...] 87. Numeral: Numerals are words that express the idea of number. There are two types of numerals: cardinal and ordinal. The cardinal numbers (one, two, three...) are used for counting people, objects, etc. Ordinal numbers (first, second, third...) can indicate order, placement in rank, etc."
1 2 "What is a numeral?". Archived from the original on 2016-11-25. Retrieved 2017-03-06.
↑ "Walsinfo.com".^{[ permanent dead link ]}
↑ "Numbers in Guaraní (Papapy Avañe'ême)". omniglot.com. Archived from the original on 2021-06-11. Retrieved 2021-06-11.
1 2 3 Blunt, Joseph (1 January 1837). "The Shipmaster's Assistant, and Commercial Digest: Containing Information Useful to Merchants, Owners, and Masters of Ships". E. & G.W. Blunt – via Google Books.
↑ Ezard, John (2 Jan 2003). "Tolkien catches up with his hobbit". The Guardian. Retrieved 6 Apr 2018.
↑ "Large Numbers (page 2) at MROB". mrob.com. Archived from the original on 2012-02-13. Retrieved 2020-12-23.
↑ Cardarelli, François (2012). Encyclopaedia of Scientific Units, Weights and Measures: Their SI Equivalences and Origins (Second ed.). Springer. p. 585. ISBN 978-1447100034.
↑ "Hammarström (2009, page 197) "Rarities in numeral systems"" (PDF). Archived from the original (PDF) on 2012-03-08. Retrieved 2010-06-16.
↑ UCL Media Relations, "Aboriginal kids can count without numbers" Archived 2018-06-20 at the Wayback Machine
↑ Butterworth, Brian; Reeve, Robert; Reynolds, Fiona; Lloyd, Delyth (2 September 2008). "Numerical thought with and without words: Evidence from indigenous Australian children". PNAS. 105 (35): 13179–13184. Bibcode:2008PNAS..10513179B. doi: 10.1073/pnas.0806045105 . PMC 2527348 . PMID 18757729. [Warlpiri] has three generic types of number words: singular, dual plural, and greater than dual plural.
↑ The Science Show, Genetic anomaly could explain severe difficulty with arithmetic Archived 2010-03-01 at the Wayback Machine , Australian Broadcasting Corporation
↑ Bernard Comrie, "The Typology of Numeral Systems Archived 2011-05-14 at the Wayback Machine ", p. 3
1 2 Ryan, Peter. Encyclopaedia of Papua and New Guinea. Melbourne University Press & University of Papua and New Guinea,:1972 ISBN 0-522-84025-6.: 3 pages p 219.
↑ Aleksandr Romanovich Luriicac, Lev Semenovich Vygotskiĭ, Evelyn Rossiter. Ape, primitive man, and child: essays in the history of behavior. CRC Press: 1992: ISBN 1-878205-43-9.
1 2 3 Heath, Thomas, A Manual of Greek Mathematics, Courier Dover: 2003. ISBN 978-0-486-43231-1 page, p:11
1 2 Parkvall, M. Limits of Language, 1st edn. 2008. p.291. ISBN 978-1-59028-210-6
↑ Ascher, Marcia (1994), Ethnomathematics: A Multicultural View of Mathematical Ideas, Chapman & Hall, ISBN 0-412-98941-7
↑ Scientific American Munn& Co: 1968, vol 219: 219
↑ such as twelve months in a year, the twelve-hour clock, twelve inches to the foot, twelve pence to the shilling
↑ "算盤 Hexadecimal Addition & Subtraction on a Chinese Abacus". totton.idirect.com. Archived from the original on 2019-07-06. Retrieved 2019-06-26.
↑ Georges Ifrah, The Universal History of Numbers: The Modern Number System, Random House, 2000: ISBN 1-86046-791-1. 1262 pages