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Naming rules (short scale)

English generally uses a decimal counting system for natural numbers. The names of the cardinal and ordinal numbers can be constructed from the below tables and a set of combining rules.

Each of the numbers specifically listed has a literal name that can be used on its own.

• To name numbers 21 through 99 that are not powers of 10, a power of ten is followed by a single digit number 1-9, and the value is the sum. For example, "42" is "forty two", which places a numeral "4" before a numeral "2" to indicate that the 4 represents "forty", or 4 times 10. "Zero" never combines with other numbers in the naming system, it is only pronounced in the name for 0.

• To name numbers 101 through 999 that are not powers of 100, the name of a digit 1-9 is followed by "hundred" (the individual values are multiplied together) to express the first digit, and the rules for smaller numbers are used for the remainder (the values of the hundreds part and the remainder are summed). For example, "642" is "six hundred forty two" and "919" is "nine hundred nineteen".

• For larger numbers, each additional numeral at the beginning of the string generally represents another power of ten. Every additional (up to) three digits are grouped using the rules for numbers 1-999, then paired with a multiplier.

So with the multiplier "thousand" for example: 2,001 is "two thousand one" and 1234 is "one thousand two hundred thirty four".

When writing in numerals, to aid comprehension these groups of three digits are typically separated—for example, with a comma in countries where the decimal mark is the period. (To be manipulated by machine, these separators are usually omitted. Lists/columns and tables of numbers may use spatial alignment in addition to or instead of commas.)

Similarly, when writing numbers with words, these groups are written using the rules for 1-999 followed by the multiplier. (Any group that is "000" is neither written in words nor pronounced.) Due to the impractical length, it is uncommon to find numbers with more than a few non-zero digits in words; more often they are simply written using Arabic numerals. Examples:

375,000 has each numeral at the place in the string of numerals that represents its power of ten. Written fully in words ("three-hundred seventy-five thousand"), the group "three-hundred seventy-five" modifies the word "thousand".

Compare 3,750, for which each word representing a numeral is immediately modified by a word representing its power of ten: "three-thousand", "seven-hundred", "fifty".

954,020,672: "nine hundred fifty four million twenty thousand six hundred seventy two" (uncommonly seen due to length)

20,000,000: "twenty million" (commonly seen due to brevity)

Ordinal numbers

When constructing names for ordinal numbers, the ordinal variant given in the charts below is only used for the final word. For example:

• fifth
• twentieth
• twenty fourth (not twentieth fourth)

Ordinal numbers can also be written with Arabic numerals, in which case the last two letters of what would be the final word in the written-out form are appended to the numerals. For example:

• 1st
• 2nd
• 3rd
• 4th
• 20th
• 21st

Systematic variations

The words for numbers less than one hundred are varied as follows: Those not expressible by a single word can when written be joined by a hyphen, as in "six hundred forty-two". In British English, the word "and" is typically inserted before them. (Some speakers of North American English also insert "and", especially when the number is below 20.) Examples:

• six hundred and two (instead of "six hundred two")
• six hundred and forty-two
• two thousand and one
• one thousand two hundred and thirty-four
• one million and one
• six hundred and twenty-two million one thousand and five

As shown on the charts below, there are two systems for the names of multipliers, known as the "long system" and "short system", though the short system is generally now preferred in English, to avoid confusion.

In countries where the comma or middle dot is used as the decimal mark, spaces or periods are used for thousands separators. Some style guides prefer no digits separator for four-digit numbers (1000-9999).

In less formal speech, the names for the numbers 11-99 (except powers of ten) can be combined with "hundred" as an alternative to a longer systematic name using both "thousand" and "hundred". For example "eleven hundred" can replace "one thousand one hundred" but "twenty hundred and two" never replaces "two thousand and two" except poetically.

For large round numbers, familiar multipliers are sometimes repeated instead of using less familiar multipliers. For example, "one billion billion" instead of "one quintillion".

In British English, the phrases "thousand million", "thousand billion", and "thousand trillion" are sometimes used in place of "billion", "trillion", and "quadrillion", respectively.

The determiners a or the can grammatically substitute for "one", as in "a hundred" or "the first thousand"; and "a couple" can be used to mean two (though to some speakers "a couple" means "a few" which could perhaps range from two to five or higher).

The names of non-counting numbers — like in a code or a sequence or a naming scheme as for years or addresses — typically use a form of the "hundreds replace thousands" variation that also drops the "hundreds". Years and addresses are never written with commas as digit separators. For example, the year 1984 is pronounced "nineteen eighty four"; referring to that year with the systematic reading "nineteen hundred eighty four" sounds old-fashioned. Sequence numbers with zero digits have additional variations. More commonly than not, a zero in only the tens place is read as "oh" (as in the letter o), like "nineteen oh four". A zero in the hundreds place triggers use of the systematic name or the "hundreds replacement" variant. Examples:

• 2001: "two thousand one" or rarely "twenty oh one"
• 2015: "two thousand fifteen" or very commonly "twenty fifteen"

One complete variation for such non-counting numbers is to read individual digits. Informally, "oh" can once again substitute for zero in this scheme. For example, "1024" could be read "one zero two four" or "one oh two four".

Small numbers

Single digits

	Cardinal number	Ordinal number
0	zero	zeroth
1	one	first
2	two	second
3	three	third
4	four	fourth
5	five	fifth
6	six	sixth
7	seven	seventh
8	eight	eighth
9	nine	ninth

Irregular numbers: 10-19

	Cardinal number	Ordinal number
10	ten	tenth
11	eleven	eleventh
12	twelve	twelfth
13	thirteen	thirteenth
14	fourteen	fourteenth
15	fifteen	fifteenth
16	sixteen	sixteenth
17	seventeen	seventeenth
18	eighteen	eighteenth
19	nineteen	nineteenth

Multiples of ten

	Cardinal number	Ordinal number
20	twenty	twentieth
30	thirty	thirtieth
40	forty	fortieth
50	fifty	fiftieth
60	sixty	sixtieth
70	seventy	seventieth
80	eighty	eightieth
90	ninety	ninetieth

Multiplying numbers

Short and long scale

	Cardinal number	Ordinal number
100	hundred	hundredth
1000	thousand	thousandth
10000	ten thousand	ten thousandth
100000	hundred thousand	hundred thousandth
1000000	million	millionth

For higher multiplying terms, the ordinal suffix is always "th".

Name	Short scale (modern)	Long scale (dated)	Authorities
			AHD4	COD	OED2	OEDnew	RHD2	SOED3	W3	UM
million	106	106	✓	✓	✓		✓	✓	✓	*
milliard		109	✓		✓		✓			✓
billion	109	1012	✓	✓	✓	✓	✓	✓	✓	*
billiard		1015					*		*	✓
trillion	1012	1018	✓	✓	✓	✓	✓	✓	✓	*
trilliard		1021	*				*		*	✓
quadrillion	1015	1024	✓		✓	✓	✓	✓	✓	*
quintillion	1018	1030	✓		✓	✓	✓	✓	✓	*
sextillion	1021	1036	✓		✓	✓	✓	✓	✓	*
septillion	1024	1042	✓		✓	✓	✓	✓	✓	*
octillion	1027	1048	✓		✓	✓	✓	✓	✓	*
nonillion	1030	1054	✓		✓	✓	✓	✓	✓	*
decillion	1033	1060	✓		✓	✓	✓	✓	✓	*
undecillion	1036	1066	✓				✓		✓	*
duodecillion	1039	1072	✓				✓		✓	*
tredecillion	1042	1078	✓				✓		✓	*
quattuordecillion	1045	1084	✓				✓		✓	*
quindecillion (quinquadecillion)	1048	1090	✓				✓		✓	*
sexdecillion (sedecillion)	1051	1096	✓				✓		✓	*
septendecillion	1054	10102	✓				✓		✓	*
octodecillion	1057	10108	✓				✓		✓	*
novemdecillion (novendecillion)	1060	10114	✓				✓		✓	*
vigintillion	1063	10120	✓		✓	✓	✓	✓	✓	*
googol	10100	10100	✓		✓	✓	✓	✓	✓	*
centillion	10303	10600	✓		✓	✓				*
googolplex	1010100	1010100	✓		✓	✓	✓	✓	✓

Usage notes

1. An asterisk (*) denotes that it has not been verified whether the term so marked is or is not mentioned in the specified work of reference.
2. The dictionary abbreviations are as follows :
   • AHD4 — the American Heritage Dictionary, 4th edition, →ISBN. [1].
   • COD — Cambridge Dictionaries Online, Cambridge, UK: Cambridge University Press.
   • OED2 — Oxford English Dictionary, 2nd edition, Oxford, UK: Oxford University Press. →ISBN (and addendums since publication in 1989).
   • OEDnew — Oxford English Dictionary, New Edition, Oxford, UK: Oxford University Press. [2] (subscription required), checked April 2007.
   • RHD2 — The Random House Dictionary, 2nd Unabridged Edition, 1987, Random House.
   • SOED3 — Shorter Oxford English Dictionary, 3rd edition, 1993, Oxford: Clarendon Press.
   • W3 — Webster's Third New International Dictionary, Unabridged, 1993, Merriam-Webster.
   • UM — How Many? A Dictionary of Units of Measures, published by Russ Rowlett and the University of North Carolina at Chapel Hill, online, accessed 1 April 2007.

     milliard[1] a unit of quantity equal to 10⁹, which is what Americans call a billion.

     billiard unit of quantity equal to 10¹⁵, which is one quadrillion in American terminology or 1000 billion in traditional British terminology. The name is coined to parallel milliard, which has long been a name for 1000 million.

     trilliard a unit of quantity equal to 10²¹, which is one sextillion in American terminology or 1000 trillion in traditional British terminology. The name is coined to parallel milliard, which has long been a name for 1000 million.

South Asian numbering system

In South Asian varieties of English, the traditional South Asian numbering system is commonly used instead of or alongside the short and long scale. This groups higher digits in pairs instead of triplets.

South Asian English	Indian figure	Power notation	Arabic figure	Short scale English
one	1	100	1	one
ten	10	101	10	ten
one hundred	100	102	100	one hundred
one thousand	1,000	103	1,000	one thousand
ten thousand	10,000	104	10,000	ten thousand
one lakh (also lac)	1,00,000	105	100,000	one hundred thousand
ten lakh	10,00,000	106	1,000,000	one million
one crore	1,00,00,000	107	10,000,000	ten million
ten crore	10,00,00,000	108	100,000,000	one hundred million
one arab / one hundred crore	1,00,00,00,000	109	1,000,000,000	one billion
one thousand crore / ten arab	10,00,00,00,000	1010	10,000,000,000	ten billion
ten thousand crore / one kharab / one hundred arab	1,00,00,00,00,000	1011	100,000,000,000	one hundred billion
one lakh crore / ten kharab / one thousand arab	10,00,00,00,00,000	1012	1,000,000,000,000	one trillion
ten lakh crore / one neel / one hundred kharab / ten thousand arab	1,00,00,00,00,00,000	1013	10,000,000,000,000	ten trillion
one crore crore / ten neel	10,00,00,00,00,00,000	1014	100,000,000,000,000	one hundred trillion
one padm / one hundred neel / ten crore crore	1,00,00,00,00,00,00,000	1015	1,000,000,000,000,000	one quadrillion
ten padm / one hundred crore crore	10,00,00,00,00,00,00,000	1016	10,000,000,000,000,000	ten quadrillion
one shankh / one hundred padm / one thousand crore crore / one lakh lakh crore	1,00,00,00,00,00,00,00,000	1017	100,000,000,000,000,000	one hundred quadrillion

General rules for very large numbers (short and long scale)

Depending on whether you are using the old European system of powers of a million, or the more current system of powers of a thousand, then the name of a number can be created by extracting the name of the power from this table and then adding -illion to the end. This method should be treated with caution and it is common to find slight spelling variations, normally to aid with the pronunciation of the resulting word. In most situations it is preferable to write numbers such as these using standard form instead of words.

	Units	Tens	Hundreds
1	un	deci	centi
2	duo	viginti	ducenti
3	tre	triginta	trecenti
4	quattor	quadraginta	quadringenti
5	quinqua	quinquaginta	quingenti
6	sex	sexaginta	sescenti
7	septe	septuaginta	septigenti
8	octo	octoginta	octingenti
9	novem	nonaginta	nongenti

For an example of how this might work consider $10^{762}$. This can be written as $1000^{254}$ using the modern system. This is then interpreted as ducenti-quinquaginta-quattor-illion using the above table. The hyphens are normally removed leaving one ducentiquinquagintaquattorillion. In the older system it would be written as $1000000^{127}$ and interpreted as one centivigintiseptillion, noting that the ‘e’ from ‘septe’ has been ellided.

Groups and multiplying words

Coefficient	Noun	Result
1	single	singlet
2	double	doublet twin
3	triple	triplet
4	quadruple	quadruplet
5	quintuple pentuple	quintuplet pentuplet
6	sextuple hextuple	sextuplet hextuplet
7	septuple heptuple	septuplet heptuplet
8	octuple	octuplet
9	nonuple	nonuplet
10	decuple	decuplet
11	undecuple hendecuple	undecuplet hendecuplet
12	duodecuple	duodecuplet
13	tredecuple	tredecuplet
100	centuple	centuplet
many	multiple	multiplet

Greek-based prefixes

Greek-based prefixes:

• 1: mono-
• 2: di-
• 3: tri-
• 4: tetra-
• 5: penta-
• 6: hexa-
• 7: hepta-
• 8: octa-
• 9: ennea-
• 10: deca-
• 12: dodeca-
• 20: icosa-
• 30: triacontra-
• 100: hecta-

Historical numerals

Numbers from a base-12 number system, base-20 numbers, and other historical numbers.

Duodecimal (base 12)

Number	Word	Mathematical formula
6	half dozen	½ × 12
12	dozen	12
13	baker's dozen	12 + 1
13	long dozen	12 + 1
72	half gross	½ × (12 × 12)
120	short gross	10 × 12
120	small gross	10 × 12
120	great hundred	12 × 10
120	long hundred	12 × 10
144	gross	12 × 12
156	long gross	(12 + 1) × 12
1200	long thousand	12 × 100
1728	great gross	12 × 12 × 12

Vigesimal (base 20)

Number	Word	Mathematical formula
20	score	20
40	twoscore	2 × 20
60	threescore	3 × 20
80	fourscore	4 × 20
100	fivescore	5 × 20
120	sixscore	6 × 20
140	sevenscore	7 × 20
160	eightscore	8 × 20
180	ninescore	9 × 20
200	tenscore	10 × 20

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• Додатак:Римски бројеви
• Категорија:Енглески бројеви
• Категорија:Енглески кардинални бројеви
• Категорија:Енглески редни бројеви

Further reading

• Names for large numbers
• Integer Powers of One Thousand
• The Googolplex Page