Mastering Vietnamese Numbers: A Comprehensive Guide

Understanding how to count and use numbers in Vietnamese is crucial for effective communication in various everyday situations. Whether you’re shopping, telling time, giving directions, or simply engaging in casual conversation, a solid grasp of Vietnamese numerals will significantly enhance your ability to interact with native speakers.

This article provides a detailed and approachable guide to learning Vietnamese numbers, covering everything from basic counting to more complex numerical expressions. It’s designed for learners of all levels, from beginners just starting their language journey to more advanced students looking to refine their numerical skills.

This comprehensive guide is structured to provide a clear and progressive learning experience. We’ll begin with the fundamental numbers, then move on to larger values, ordinal numbers, and common numerical expressions.

Each section includes numerous examples and practical exercises to reinforce your understanding and build confidence in your ability to use Vietnamese numbers accurately and fluently. By the end of this article, you’ll have a solid foundation in Vietnamese numeration, enabling you to navigate a wide range of real-world scenarios with ease.

Table of Contents

1. Introduction
2. Definition of Vietnamese Numbers
3. Structural Breakdown of Vietnamese Numbers
4. Basic Numbers (0-10)
5. Numbers 11-19
6. Tens (20-90)
7. Hundreds
8. Thousands
9. Larger Numbers (Millions, Billions)
10. Ordinal Numbers
11. Fractions and Decimals
12. Numbers in the Context of Money
13. Numbers in the Context of Time
14. Numbers in the Context of Age
15. Usage Rules
16. Common Mistakes
17. Practice Exercises
18. Advanced Topics
19. FAQ
20. Conclusion

Definition of Vietnamese Numbers

Vietnamese numbers are the system used to represent numerical values in the Vietnamese language. Similar to other languages, Vietnamese has unique words and structures for expressing quantities, amounts, and positions.

Understanding this system is essential for basic communication, as numbers are frequently used in daily life for various purposes, including counting, measuring, telling time, and handling money. The Vietnamese number system is primarily decimal-based, meaning it uses a base of 10, mirroring the structure found in many other languages worldwide.

However, the way these numbers are constructed and combined can be quite distinct, requiring a careful and systematic approach to learning.

The function of Vietnamese numbers extends beyond simple arithmetic. They play a crucial role in various contexts, such as expressing age, dates, addresses, phone numbers, and prices.

Moreover, Vietnamese culture incorporates numbers into idioms, superstitions, and traditional practices, adding another layer of complexity to their use. For instance, certain numbers are considered lucky or unlucky, influencing decisions related to business, weddings, and even housing.

Therefore, a deep understanding of Vietnamese numbers not only enhances linguistic proficiency but also provides insights into cultural nuances.

Structural Breakdown of Vietnamese Numbers

The structure of Vietnamese numbers follows a logical pattern, building from basic units to larger quantities. The numbers from zero to ten form the foundation, with each number having a unique name.

These basic numbers are then combined to form numbers from eleven to nineteen, and then tens, hundreds, thousands, and so on. Understanding how these components fit together is key to mastering the entire system.

The formation of numbers in Vietnamese often involves combining a base number with prefixes or suffixes that indicate its position in the decimal system. For example, numbers from eleven to nineteen are formed by adding the word “mười” (ten) to the basic numbers.

Similarly, tens are formed by combining the basic numbers with “mươi” (a form of ten). This additive structure makes it easier to learn larger numbers once the basic building blocks are understood.

However, there are some irregularities and exceptions that need to be memorized, which will be outlined in the following sections.

Basic Numbers (0-10)

The foundation of the Vietnamese number system lies in the numbers from zero to ten. These are the building blocks for constructing all other numbers.

It’s crucial to memorize these first, as they are used in almost every numerical expression.

Here’s a table listing the basic numbers in Vietnamese, along with their pronunciations:

Number	Vietnamese	Pronunciation
0	không	khawng
1	một	moht (North) / muh’t (South)
2	hai	hai
3	ba	bah
4	bốn	bohn
5	năm	nahm
6	sáu	sau
7	bảy	byee
8	tám	tahm
9	chín	cheen
10	mười	muh-uh’i

It’s important to note that the pronunciation of some Vietnamese words can vary slightly depending on the region. The pronunciations provided here are general guidelines, and you may encounter slight variations in different parts of Vietnam.

Numbers 11-19

Numbers from eleven to nineteen are formed by combining “mười” (ten) with the basic numbers from one to nine. The structure is generally straightforward: “mười” + number.

However, there are a few exceptions to note.

Here’s a table showing the numbers from eleven to nineteen:

Number	Vietnamese	Pronunciation
11	mười một	muh-uh’i moht
12	mười hai	muh-uh’i hai
13	mười ba	muh-uh’i bah
14	mười bốn	muh-uh’i bohn
15	mười lăm	muh-uh’i lahm
16	mười sáu	muh-uh’i sau
17	mười bảy	muh-uh’i byee
18	mười tám	muh-uh’i tahm
19	mười chín	muh-uh’i cheen

Notice that the number 5 changes from “năm” to “lăm” when combined with “mười” to form 15. This is an important exception to remember.

It’s also worth noting that the pronunciation of vowels can shift slightly depending on the context, but the general pronunciations provided should be helpful.

Tens (20-90)

To form the tens (20, 30, 40, etc.), you combine the basic numbers from two to nine with “mươi” (a form of ten). The structure is: number + “mươi”.

For example, 20 is “hai mươi” (two ten).

Here’s a table showing the tens from 20 to 90:

Number	Vietnamese	Pronunciation
20	hai mươi	hai muh-uh’i
30	ba mươi	bah muh-uh’i
40	bốn mươi	bohn muh-uh’i
50	năm mươi	nahm muh-uh’i
60	sáu mươi	sau muh-uh’i
70	bảy mươi	byee muh-uh’i
80	tám mươi	tahm muh-uh’i
90	chín mươi	cheen muh-uh’i

When forming numbers like 21, 32, 43, etc., you combine the tens with the basic numbers. For example, 21 is “hai mươi mốt”.

Note that “một” (one) often changes to “mốt” when it follows a ten. Also, for numbers ending in 4 or 5, ‘tư’ is commonly used instead of ‘bốn’ when following a ten, and ‘lăm’ is used instead of ‘năm’.

So 24 is ‘hai mươi tư’ and 35 is ‘ba mươi lăm’.

Hundreds

To express hundreds, you combine the basic numbers from one to nine with “trăm” (hundred). The structure is: number + “trăm”.

For example, 100 is “một trăm” (one hundred).

Here’s a table showing examples of hundreds:

Number	Vietnamese	Pronunciation
100	một trăm	moht trahm
200	hai trăm	hai trahm
300	ba trăm	bah trahm
400	bốn trăm	bohn trahm
500	năm trăm	nahm trahm
600	sáu trăm	sau trahm
700	bảy trăm	byee trahm
800	tám trăm	tahm trahm
900	chín trăm	cheen trahm

When forming numbers like 101, 215, 350, etc., you combine the hundreds with the tens and basic numbers. For example, 101 is “một trăm linh một”.

The word “linh” is often used to indicate a zero in the tens place. 215 is “hai trăm mười lăm”, and 350 is “ba trăm năm mươi”.

Thousands

To express thousands, you combine the basic numbers from one to nine with “nghìn” or “ngàn” (thousand). Both “nghìn” and “ngàn” are commonly used and interchangeable, although “nghìn” is slightly more formal.

The structure is: number + “nghìn/ngàn”. For example, 1,000 is “một nghìn” or “một ngàn” (one thousand).

Here are some examples of thousands:

Number	Vietnamese	Pronunciation
1,000	một nghìn / một ngàn	moht ngeen / moht ngahn
2,000	hai nghìn / hai ngàn	hai ngeen / hai ngahn
3,000	ba nghìn / ba ngàn	bah ngeen / bah ngahn
4,000	bốn nghìn / bốn ngàn	bohn ngeen / bohn ngahn
5,000	năm nghìn / năm ngàn	nahm ngeen / nahm ngahn
6,000	sáu nghìn / sáu ngàn	sau ngeen / sau ngahn
7,000	bảy nghìn / bảy ngàn	byee ngeen / byee ngahn
8,000	tám nghìn / tám ngàn	tahm ngeen / tahm ngahn
9,000	chín nghìn / chín ngàn	cheen ngeen / cheen ngahn

When forming numbers like 1,001, 2,345, 3,700, etc., you combine the thousands with the hundreds, tens, and basic numbers. For example, 1,001 is “một nghìn không trăm linh một”. 2,345 is “hai nghìn ba trăm bốn mươi lăm”, and 3,700 is “ba nghìn bảy trăm”.

Larger Numbers (Millions, Billions)

Vietnamese also has words for larger numbers like millions and billions. These are used in the same way as the previous numbers, combined to form even larger values.

Here are the terms for million and billion in Vietnamese:

Number	Vietnamese	Pronunciation
Million	triệu	tree-uh’oo
Billion	tỷ	tee’

To form larger numbers, you combine these terms with the basic numbers. For example, 1,000,000 (one million) is “một triệu”, and 1,000,000,000 (one billion) is “một tỷ”.

Numbers can then be built up as follows: 2,500,000 is “hai triệu năm trăm nghìn” (two million five hundred thousand) and 3,250,000,000 is “ba tỷ hai trăm năm mươi triệu” (three billion two hundred fifty million).

Ordinal Numbers

Ordinal numbers indicate position or order (first, second, third, etc.). In Vietnamese, ordinal numbers are formed by placing the word “thứ” before the cardinal number (one, two, three, etc.).

Here’s a table showing examples of ordinal numbers:

Ordinal Number	Vietnamese	Pronunciation
First	thứ nhất	thuh’ nuh’t
Second	thứ hai	thuh’ hai
Third	thứ ba	thuh’ bah
Fourth	thứ bốn	thuh’ bohn
Fifth	thứ năm	thuh’ nahm
Sixth	thứ sáu	thuh’ sau
Seventh	thứ bảy	thuh’ byee
Eighth	thứ tám	thuh’ tahm
Ninth	thứ chín	thuh’ cheen
Tenth	thứ mười	thuh’ muh-uh’i

Note that “nhất” is used instead of “một” for “first.” For numbers greater than ten, the same rule applies: “thứ” + cardinal number. For example, the twenty-first is “thứ hai mươi mốt”.

Fractions and Decimals

Expressing fractions and decimals in Vietnamese requires specific terminology. Fractions are typically expressed using the structure “number + phần + number,” where “phần” means “part” or “portion.” Decimals use the word “phẩy” to indicate the decimal point.

Here’s a table showing examples of fractions and decimals:

Fraction/Decimal	Vietnamese	Pronunciation
1/2	một phần hai	moht fuhn hai
1/4	một phần tư	moht fuhn tuh
3/4	ba phần tư	bah fuhn tuh
0.5	không phẩy năm	khawng feye nahm
1.25	một phẩy hai mươi lăm	moht feye hai muh-uh’i lahm
2.75	hai phẩy bảy mươi lăm	hai feye byee muh-uh’i lahm

For fractions, the numerator comes first, followed by “phần,” and then the denominator. For decimals, “phẩy” separates the whole number from the decimal portion.

Each digit after “phẩy” is read individually.

Numbers in the Context of Money

When dealing with money in Vietnamese, it’s important to understand the currency and how to express amounts. The Vietnamese currency is the Dong (VND).

When stating prices, you typically use the number followed by the currency unit.

Here are some examples of expressing prices in Vietnamese:

Price	Vietnamese	Pronunciation
10,000 VND	mười nghìn đồng	muh-uh’i ngeen dawng
25,000 VND	hai mươi lăm nghìn đồng	hai muh-uh’i lahm ngeen dawng
50,000 VND	năm mươi nghìn đồng	nahm muh-uh’i ngeen dawng
100,000 VND	một trăm nghìn đồng	moht trahm ngeen dawng
1,000,000 VND	một triệu đồng	moht tree-uh’oo dawng

It’s common to omit the “đồng” (VND) when the context is clear. For example, instead of saying “mười nghìn đồng,” you can simply say “mười nghìn.”

Numbers in the Context of Time

Telling time in Vietnamese involves using numbers to express hours, minutes, and seconds. The word “giờ” is used for “hour,” “phút” is used for “minute,” and “giây” is used for “second.”

Here are some examples of telling time in Vietnamese:

Time	Vietnamese	Pronunciation
1:00	một giờ	moht zuh’
2:30	hai giờ ba mươi phút	hai zuh’ bah muh-uh’i foot
3:15	ba giờ mười lăm phút	bah zuh’ muh-uh’i lahm foot
4:45	bốn giờ bốn mươi lăm phút	bohn zuh’ bohn muh-uh’i lahm foot
10:00 AM	mười giờ sáng	muh-uh’i zuh’ sa’ng
7:00 PM	bảy giờ tối	byee zuh’ toy’

When expressing time, you typically state the hour first, followed by the minutes and seconds. You can also use “sáng” (morning), “chiều” (afternoon), or “tối” (evening) to specify the time of day.

Numbers in the Context of Age

Expressing age in Vietnamese is straightforward. You simply use the number followed by the word “tuổi” (years old).

Here are some examples of expressing age in Vietnamese:

Age	Vietnamese	Pronunciation
1 year old	một tuổi	moht too-ee’
10 years old	mười tuổi	muh-uh’i too-ee’
25 years old	hai mươi lăm tuổi	hai muh-uh’i lahm too-ee’
40 years old	bốn mươi tuổi	bohn muh-uh’i too-ee’
65 years old	sáu mươi lăm tuổi	sau muh-uh’i lahm too-ee’

When asking someone’s age, you can say “Bạn bao nhiêu tuổi?” (How old are you?). The response would be “Tôi [number] tuổi” (I am [number] years old).

Usage Rules

There are several important usage rules to keep in mind when working with Vietnamese numbers. These rules govern how numbers are combined, pronounced, and used in different contexts.

Adhering to these rules will help you communicate more accurately and effectively.

• “Một” vs. “Mốt”: When “một” (one) follows a ten (e.g., 21, 31, 41), it often changes to “mốt.” For example, 21 is “hai mươi mốt,” not “hai mươi một.”
• “Năm” vs. “Lăm”: Similarly, when “năm” (five) follows a ten (e.g., 25, 35, 45), it changes to “lăm.” For example, 25 is “hai mươi lăm,” not “hai mươi năm.”
• ‘Bốn’ vs. ‘Tư’: When ‘bốn’ (four) follows a ten, it is more common to say ‘tư’. For example, 24 is ‘hai mươi tư’.
• Using “Linh”: The word “linh” is used to indicate a zero in the tens place when it is between the hundreds and the basic number. For example, 101 is “một trăm linh một.”
• Currency: Remember to include the currency unit (đồng) when stating prices, although it can be omitted if the context is clear.
• Time: When telling time, use “giờ” for hours, “phút” for minutes, and “giây” for seconds. Also, specify the time of day using “sáng,” “chiều,” or “tối” if necessary.

These rules are essential for accurate and natural-sounding Vietnamese. Pay close attention to these details as you practice using numbers in different situations.

Common Mistakes

When learning Vietnamese numbers, it’s common to make certain mistakes, especially in the beginning. Being aware of these common errors can help you avoid them and improve your accuracy.

Here are some frequent mistakes and how to correct them:

Incorrect	Correct	Explanation
hai mươi một	hai mươi mốt	“Một” changes to “mốt” when following a ten.
hai mươi năm	hai mươi lăm	“Năm” changes to “lăm” when following a ten.
một trăm mười	một trăm mười	This is correct, do not need ‘linh’ after trăm if there are tens.
một nghìn không một	một nghìn không trăm linh một	Use “linh” to indicate a zero in the tens place between the hundreds and the basic number.
hai giờ hai mươi	hai giờ hai mươi phút	Include “phút” when stating the minutes.
ba mươi bốn	ba mươi tư	Use ‘tư’ instead of ‘bốn’ after a ten.

By paying attention to these common mistakes and practicing the correct forms, you can significantly improve your fluency and accuracy in using Vietnamese numbers.

Practice Exercises

To solidify your understanding of Vietnamese numbers, it’s essential to practice using them in various contexts. Here are some exercises to help you test your knowledge and build confidence.

Exercise 1: Translation

Translate the following numbers into Vietnamese:

Number	Your Answer	Correct Answer
17		mười bảy
32		ba mươi hai
55		năm mươi lăm
89		tám mươi chín
105		một trăm linh năm
250		hai trăm năm mươi
578		năm trăm bảy mươi tám
1,234		một nghìn hai trăm ba mươi bốn
5,000		năm nghìn
10,000		mười nghìn

Exercise 2: Word Problems

Solve the following word problems and express the answers in Vietnamese:

Problem	Your Answer	Correct Answer
5 + 7 = ?		mười hai
20 – 8 = ?		mười hai
4 x 6 = ?		hai mươi bốn
30 / 5 = ?		sáu
15 + 25 = ?		bốn mươi
100 – 35 = ?		sáu mươi lăm
50 x 2 = ?		một trăm
200 / 4 = ?		năm mươi
1000 + 500 = ?		một nghìn năm trăm
2000 – 750 = ?		một nghìn hai trăm năm mươi

Exercise 3: Telling Time

Translate the following times into Vietnamese:

Time	Your Answer	Correct Answer
6:00 AM		sáu giờ sáng
9:30 AM		chín giờ ba mươi phút sáng
12:00 PM		mười hai giờ trưa
3:15 PM		ba giờ mười lăm phút chiều
7:45 PM		bảy giờ bốn mươi lăm phút tối
10:00 PM		mười giờ tối
1:00 AM		một giờ sáng
4:30 PM		bốn giờ ba mươi phút chiều
11:15 AM		mười một giờ mười lăm phút sáng
5:45 AM		năm giờ bốn mươi lăm phút sáng

These exercises will help you practice translating numbers, solving word problems, and telling time in Vietnamese. Be sure to review the correct answers to identify any areas where you need further practice.

Advanced Topics

For advanced learners, there are more complex aspects of Vietnamese numbers to explore. These topics delve into nuanced usage and cultural contexts.

• Lucky and Unlucky Numbers: In Vietnamese culture, certain numbers are considered lucky or unlucky. For example, the number 8 (bát) is considered lucky because its pronunciation is similar to the word for “prosperity” (phát). On the other hand, the number 4 (bốn) is often considered unlucky because its pronunciation is similar to the word for “death” (tử). Understanding these cultural associations can help you navigate social situations more effectively.
• Regional Variations: While the basic structure of Vietnamese numbers is consistent across the country, there may be slight regional variations in pronunciation and usage. Being aware of these differences can help you better understand and communicate with people from different parts of Vietnam.
• Numbers in Idioms and Proverbs: Vietnamese idioms and proverbs often incorporate numbers, adding another layer of complexity to their meaning. Learning these expressions can enhance your overall understanding of the language and culture.

Exploring these advanced topics will deepen your understanding of Vietnamese numbers and their role in Vietnamese culture.

FAQ

Here are some frequently asked questions about Vietnamese numbers:

1. Why does “năm” change to “lăm” after “mười”?
   This is a phonetic change that occurs for ease of pronunciation. It’s a common feature in Vietnamese where sounds can shift depending on the surrounding context.
2. What’s the difference between “nghìn” and “ngàn”?
   Both “nghìn” and “ngàn” mean “thousand” and are largely interchangeable. However, “nghìn” is slightly more formal and often preferred in written contexts.
3. How do I say a phone number in Vietnamese?
   You typically say each digit individually. For example, 090-123-4567 would be “không chín không, một hai ba, bốn năm sáu bảy.”
4. Is it necessary to say “đồng” after every price?
   No, it’s not always necessary. If the context is clear that you’re talking about money, you can omit “đồng.” However, it’s always polite to include it, especially in formal situations.

Conclusion

Mastering Vietnamese numbers is a fundamental step in achieving fluency in the language. This comprehensive guide has provided you with a solid foundation in Vietnamese numeration, covering everything from basic counting to more complex numerical expressions.

By understanding the structure of Vietnamese numbers, practicing the pronunciation, and being aware of common usage rules, you can confidently navigate a wide range of real-world scenarios.

Remember that consistent practice is key to mastering any new skill. Continue to practice using Vietnamese numbers in your daily life, whether you’re shopping, telling time, or simply engaging in conversation.

With dedication and perseverance, you’ll be well on your way to becoming proficient in Vietnamese.