Vietnamese numerals

Historically Vietnamese has two sets of numbers: one is etymologically native Vietnamese; the other uses Sino-Vietnamese vocabulary. In the modern language the native Vietnamese vocabulary is used for both everyday counting and mathematical purposes. The Sino-Vietnamese vocabulary is used only in fixed expressions or in Sino-Vietnamese words. This is somewhat analogous to the way in which Latin and Greek numerals are used in modern English (e.g., the bi- in bicycle). Sino-Vietnamese words are also used for units of ten thousand or above, where native vocabulary was lacking.

Concept

Among the languages of the Chinese cultural sphere, Japanese and Korean both use two numerical systems, one native and one Chinese-based. The Chinese-based vocabulary is the one in common use. In Vietnamese, on the other hand, the Chinese-based system is not in everyday use. Numbers from 1 to 1000 are expressed using native Vietnamese vocabulary, and only a few numbers (such as 1,000,000, triệu) are based on Sino-Vietnamese vocabulary.

In the modern Vietnamese writing system, numbers are written in the romanized script quốc ngữ or Arabic numerals. Prior to the 20th century Vietnam officially used Classical Chinese as a written language, using Chinese characters to write Sino-Vietnamese numbers. For non-official purposes Vietnamese also had a writing system known as Hán-Nôm. Under this system, Sino-Vietnamese numbers were written in Hán tự (Chinese characters) and native vocabulary was written in a system of modified Chinese characters known as Chữ Nôm.

Basic figures

Basic features of the Vietnamese numbering system include the following:

• Unlike other sinoxenic numbering systems, Vietnamese separates place values in thousands rather than myriads. For example, "123123123" is recorded in Vietnamese as "một trăm hai mươi ba triệu một trăm hai mươi ba nghìn (ngàn) một trăm hai mươi ba, or '123 million, 123 thousand and 123', whilst in Chinese, Japanese and Korean, the same number is rendered "1億2312萬3123" (1 hundred-million, 2312 ten-thousand and 3123).
• The Sino-Vietnamese numbers are not in frequent use in modern Vietnamese. Sino-Vietnamese numbers such as "vạn／萬" 'ten thousand', "ức／億" 'hundred-thousand' and "triệu／兆" 'million' are used for figures exceeding one thousand, but with the exception of "triệu" are becoming less commonly used. Number values for these words follow usage in Ancient China, with each numeral increasing tenfold in digit value, 億 being the number for 10⁵, 兆 for 10⁶, et cetera. (See Chinese numerals#Large numbers). As a result, the value of "triệu" differs from modern Chinese 兆.
• Outside of fixed Sino-Vietnamese expressions, Sino-Vietnamese words are usually used in combination with native Vietnamese words. For instance, "mười triệu" combines native "mười" and Sino-Vietnamese "triệu".

The following table is an overview of the basic Vietnamese numeric figures, provided in both Native and Sino-Viet forms. For each number, the form that is more commonly used is highlighted. Where there are differences between the Hanoi and Saigon dialects of Vietnamese, readings between each are differentiated below within the notes.

Number	Sino-Vietnamese		Native Vietnamese		Notes
	Quốc Ngữ	Hán tự	Quốc Ngữ	Chữ Nôm
0	không • linh	空 • 〇（零）	(none)	(none)	The foreign-language borrowed word "zêrô (zêro, dê-rô)" is often used in physics-related publications, or colloquially.
1	nhất	一（壹）	một	𠬠
2	nhị	二（貳）	hai	𠄩
3	tam	三（叄）	ba	𠀧
4	tứ	四（肆）	bốn	𦊚	In the ordinal number system, the Sino-Viet "tư／四" is more systematic; as the digit 4 appears after the number 20 when counting upwards, the Sino-Viet "tư／四" is more commonly used.
5	ngũ	五（伍）	năm	𠄼	Within the Hanoi dialect, five may also be pronounced as "lăm" whilst as part of a two-digit number ending in 5 (such as 15, 25, 35...) to avoid possible confusion with homonyms of năm, an example being "năm/𢆥", meaning "year".
6	lục	六（陸）	sáu	𦒹
7	thất	七（柒）	bảy	𦉱	In some Vietnamese dialects, it is also read as "bẩy".
8	bát	八（捌）	tám	𠔭
9	cửu	九（玖）	chín	𠃩
10	thập	十（拾）	mười	𨒒
100	bách	百（佰）	trăm • một trăm	𤾓 • 𠬠𤾓	The Sino-Viet "bách／百" is commonly used as a morpheme (in compound words), and is rarely used in the field of mathematics as a digit. Example: "bách phát bách trúng／百發百中".
1,000	thiên	千（仟）	nghìn (ngàn) • một nghìn (ngàn)	𠦳 • 𠬠𠦳	The Sino-Viet "thiên／千" is commonly used as a morpheme, but rarely used in a mathematical sense. Example: "thiên kim／千金". "nghìn" is the standard reading in Northern Vietnam, whilst "ngàn" is the pronunciation in the South.
10,000	vạn • một vạn	萬 • 𠬠萬	mười nghìn (ngàn)	𨒒𠦳	The "một／𠬠" within "một vạn／𠬠萬" is a Native Vietnamese (intrinsic term) morpheme.
100,000	ức • một ức • mười vạn	億 • 𠬠億 • 𨒒萬	trăm nghìn (ngàn) • một trăm nghìn (ngàn)	𤾓𠦳 • 𠬠𤾓𠦳	The "mười／𨒒" and "một／𠬠" within "mười vạn／𨒒萬" and "một ức／𠬠億" are Native Vietnamese (intrinsic term) morphemes.
1,000,000	triệu • một triệu • một trăm vạn	兆 • 𠬠兆 • 𠬠𤾓萬	(none)	(none)	The "một／𠬠" and "trăm／𤾓" within "một triệu／𠬠兆" and "một trăm vạn／𠬠𤾓萬" are Native Vietnamese (intrinsic term) morphemes.
10,000,000	mười triệu	𨒒兆	(mixed usage of Sino-Viet and Native Viet systems)	(mixed usage of Sino-Viet and Native Viet systems)	The "mười／𨒒" within "mười triệu／𨒒兆" is a Native Vietnamese (intrinsic term) morpheme.
100,000,000	trăm triệu	𤾓兆	(mixed usage of Sino-Viet and Native Viet systems)	(mixed usage of Sino-Viet and Native Viet systems)	The "trăm／𤾓" within "trăm triệu／𤾓兆" is a Native Vietnamese (intrinsic term) morpheme.
1,000,000,000	tỷ	秭	(none)	(none)

Other figures

Number	Quốc Ngữ	Hán-Nôm	Notes
11	mười một	𨒒𠬠
12	mười hai • một tá	𨒒𠄩 • 𠬠 tá	"một tá／𠬠 tá" is often used within mathematics-related occasions, to which "tá" represents the foreign loanword "dozen".
14	mười bốn • mười tư	𨒒𦊚 • 𨒒四	"mười tư／𨒒四" is often used within literature-related occasions, to which "tư／四" forms part of the Sino-Viet vocabulary.
15	mười lăm	𨒒𠄻	Here, five is pronounced "lăm", or also "nhăm" by some speakers in the north.
19	mười chín	𨒒𠃩
20	hai mươi • hai chục	𠄩𨒒 • 𠄩𨔿
21	hai mươi mốt	𠄩𨒒𠬠	For numbers which include the digit 1 from 21 to 91, the number 1 is pronounced "mốt".
24	hai mươi tư	𠄩𨒒四	When the digit 4 appears in numbers after 20, it is more common to use "tư／四".
25	hai mươi lăm	𠄩𨒒𠄻	Here, five is pronounced "lăm".
50	năm mươi • năm chục	𠄼𨒒 • 𠄼𨔿	When "𨒒" (10) appears after the number 20, the pronunciation changes to "mươi".
101	một trăm linh một • một trăm lẻ một	𠬠𤾓零𠬠 • 𠬠𤾓𥘶𠬠	Although "một trăm linh một／𠬠𤾓零𠬠" is the standard form, it is more commonly used in Northern Vietnam, where "linh／零" forms part of the Sino-Vietnamese vocabulary; "một trăm lẻ một／𠬠𤾓𥘶𠬠" is more commonly used in the South.
1001	một nghìn (ngàn) không trăm linh một • một nghìn (ngàn) không trăm lẻ một	𠬠𠦳空𤾓零𠬠 • 𠬠𠦳空𤾓𥘶𠬠	When the hundreds digit is occupied by a zero, these are expressed using "không trăm／空𤾓".
10055	mười nghìn (ngàn) không trăm năm mươi lăm	𨒒𠦳空𤾓𠄼𨒒𠄻

• When the number 1 appears after 20 in the unit digit, the pronunciation changes to "mốt".
• When the number 4 appears after 20 in the unit digit, it is more common to use Sino-Viet "tư／四".
• When the number 5 appears after 10 in the unit digit, the pronunciation changes to "lăm".
• When "mười" appears after 20, the pronunciation changes to "mươi".

Ordinal numbers

Vietnamese ordinal numbers are generally preceded by the prefix "thứ", which is a Sino-Viet word which corresponds to "次". For the ordinal numbers of one and four, the Sino-Viet readings "nhất／一" and "tư／四" are more commonly used; two is occasionally rendered using the Sino-Viet "nhì／二". In all other cases, the native Vietnamese number is used.

Ordinal number	Quốc Ngữ	Hán-Nôm
1st	thứ nhất	次一
2nd	thứ hai • thứ nhì	次𠄩 • 次二
3rd	thứ ba	次𠀧
4th	thứ tư	次四
5th	thứ năm	次𠄼
nth	thứ …	次…

See also

• Chinese numerals
• Japanese numerals
• Korean numerals