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Naming rules (short scale)[уреди]

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[уреди]

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[уреди]

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[уреди]

Single digits[уреди]

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[уреди]

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[уреди]

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[уреди]

Short and long scale[уреди]

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
Long scale
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[уреди]

  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 :
    • AHD4the American Heritage Dictionary, 4th edition, →ISBN 0-395-82517-2. [1].
    • CODCambridge Dictionaries Online, Cambridge, UK: Cambridge University Press.
    • OED2Oxford English Dictionary, 2nd edition, Oxford, UK: Oxford University Press. →ISBN 0198611862 (and addendums since publication in 1989).
    • OEDnewOxford English Dictionary, New Edition, Oxford, UK: Oxford University Press. [2] (subscription required), checked April 2007.
    • RHD2The Random House Dictionary, 2nd Unabridged Edition, 1987, Random House.
    • SOED3Shorter Oxford English Dictionary, 3rd edition, 1993, Oxford: Clarendon Press.
    • W3Webster's Third New International Dictionary, Unabridged, 1993, Merriam-Webster.
    • UMHow 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[уреди]

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)[уреди]

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.[1]

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 . This can be written as 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 and interpreted as one centivigintiseptillion, noting that the ‘e’ from ‘septe’ has been ellided.

Groups and multiplying words[уреди]

Coefficient Noun Result
1 single singlet
2 double doublet
3 triple triplet
4 quadruple quadruplet
5 quintuple
6 sextuple
7 septuple
8 octuple octuplet
9 nonuple nonuplet
10 decuple decuplet
11 undecuple
12 duodecuple duodecuplet
13 tredecuple tredecuplet
100 centuple centuplet
many multiple multiplet

Greek-based prefixes[уреди]

Greek-based prefixes:

Historical numerals[уреди]

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

Duodecimal (base 12)[уреди]

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)[уреди]

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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