Số đếm — Vietnamese Numbers 1-100

Meaning & Usage

Learning to count is one of the most fundamental steps in mastering any new language, and Vietnamese is no exception. The Vietnamese numbering system, known as số đếm, for numbers 1 to 100 is largely logical and additive, making it relatively straightforward for beginners to grasp. Unlike some European languages that have irregular forms for numbers like 'eleven' or 'twenty', Vietnamese consistently builds upon a core set of base numbers.

The numbers from one to ten form the foundation:

• một (one)
• hai (two)
• ba (three)
• bốn (four)
• năm (five)
• sáu (six)
• bảy (seven)
• tám (eight)
• chín (nine)
• mười (ten)

Once you understand these, forming larger numbers becomes a matter of combining them. For example, 'eleven' is mười một (ten one), 'twelve' is mười hai (ten two), and so on, up to mười chín (ten nine). This pattern is very similar to how numbers are constructed in English after ten (e.g., 'thirteen' as 'three-ten' conceptually, though not overtly). The key difference is that Vietnamese explicitly states the 'ten' part.

When we move to numbers in the twenties, thirties, and beyond, the pattern continues to be additive, but with a slight variation. For 'twenty', we say hai mươi (two ten). For 'twenty-one', it's hai mươi mốt. Notice the change from một to mốt. Similarly, for numbers ending in 'five', like 'twenty-five', it becomes hai mươi lăm instead of hai mươi năm. These specific changes for 'one' and 'five' when they are the trailing digit in a compound number are crucial. For numbers like 'twenty-four', it's simply hai mươi bốn. The word mươi is used for the tens place when it's not the number ten itself. It's often pronounced slightly differently, a bit softer, than mười.

This system provides a clear mental model: you state the 'tens' block, then the 'units' block. For instance, 'fifty-seven' is năm mươi bảy (five tens seven). This structure is quite logical and less complex than, for example, French, which uses a vigesimal system for some numbers (e.g., 'quatre-vingts' for eighty). Compared to other East Asian languages like Chinese (Hán-Việt influence: 十 for ten, 一 for one, so 十一 for eleven), Vietnamese follows a similar additive logic, but with its own unique pronunciation nuances and specific word changes for trailing 'one' and 'five'. There isn't a significant formal vs. informal distinction for basic counting; however, pronunciation differences between Northern and Southern Vietnamese can be noted, especially for numbers like 'năm' (five), where the 'n' sound might vary.

Structure & Formation

The Vietnamese numbering system from 1 to 100 is based on combining base numbers. The core structure involves a 'tens' component followed by a 'units' component.

Base Numbers 1-10

Numbers 11-19

Formula: mười + unit

Numbers 20-99

Formula: tens_digit + mươi + unit_digit

• For 'tens' (20, 30, ..., 90): tens_digit + mươi (e.g., hai mươi, ba mươi)
• For numbers ending in 1 (21, 31, ..., 91): tens_digit + mươi + mốt (e.g., hai mươi mốt, ba mươi mốt)
• For numbers ending in 5 (25, 35, ..., 95): tens_digit + mươi + lăm (e.g., hai mươi lăm, ba mươi lăm)
• For other numbers (22, 23, 24, 26-29, etc.): tens_digit + mươi + unit_digit (e.g., hai mươi hai, hai mươi bốn)

Number 100

một trăm (one hundred)

Example Sentences

Counting Everyday Objects

Telling Age

Prices and Shopping

Time and Dates

Phone Numbers and Addresses

General Counting

Common Mistakes

Mistake 1: Confusing "mười" and "mươi"

❌ Tôi có hai mười cuốn sách.

✅ Tôi có hai mươi cuốn sách.

Explanation: mười specifically refers to the number 10. When forming numbers like 20, 30, 40, etc., the word for 'tens' is mươi. While they sound similar to foreign ears, their usage is distinct. For example, 10 is mười, but 20 is hai mươi, not hai mười.

Mistake 2: Forgetting to use "mốt" for trailing 'one'

❌ Ba mươi một

✅ Ba mươi mốt

Explanation: When 'one' (một) appears as the last digit in a compound number (from 21 to 91), it transforms into mốt. This is a common rule and applies consistently. So, 21 is hai mươi mốt, 31 is ba mươi mốt, and so on.

Mistake 3: Forgetting to use "lăm" for trailing 'five'

❌ Sáu mươi năm

✅ Sáu mươi lăm

Explanation: Similar to 'one', when 'five' (năm) is the last digit in a compound number (from 25 to 95), it usually changes to lăm. This is particularly important for clarity, as năm (five) can sometimes sound like năm (year) or have other meanings in different contexts.

Mistake 4: Incorrect tone marks (Diacritics)

❌ Một, hai, ba, bôn, nam, sau, bay, tam, chin, muoi

✅ Một, hai, ba, bốn, năm, sáu, bảy, tám, chín, mười

Explanation: Vietnamese is a tonal language, and correct tone marks (diacritics) are essential for distinguishing words. Even if a number sounds approximately correct without the tone mark, it will likely be misunderstood or sound unnatural to a native speaker. Pay close attention to the tone marks for each number, as they are integral to the word's identity.

Mistake 5: Pronunciation of "bốn" and "năm"

❌ Mispronouncing the 'ô' in bốn or the 'ă' in năm leading to confusion with other words.

✅ Clear pronunciation of bốn (falling-rising tone, like 'bohn') and năm (rising tone, like 'nahm').

Explanation: For speakers of non-tonal languages, differentiating tones can be challenging. The word bốn (four) has a distinct tone. Similarly, năm (five) needs its short 'a' vowel and rising tone to be clear. Without careful pronunciation, these could be confused with words like 'bon' (to give a bonus) or 'nan' (hardship) which have different meanings and tones, particularly for Chinese and Korean learners who might struggle with the specific vowel sounds and tones.

Cultural Notes

Numbers in Vietnam are used extensively in daily interactions, from bargaining at markets to exchanging phone numbers. While the counting system itself is straightforward, some cultural nuances exist around numbers.

For instance, some numbers are considered lucky or unlucky. The number bốn (four) is sometimes associated with death (tử - Hán-Việt, similar to Japanese し "shi" and Chinese "sì") in certain contexts, so you might find buildings skipping the 4th floor, similar to East Asian superstitions. Conversely, numbers like sáu (six, representing 'lộc' - prosperity), tám (eight, representing 'phát' - fortune or to make rich), and chín (nine, representing 'trường' - longevity or eternity) are highly favored, especially in business or for important dates. You might see people paying extra for phone numbers or license plates containing many 6s, 8s, or 9s. For example, a phone number like 'tám tám tám' (888) would be very desirable.

When giving out phone numbers or addresses, Vietnamese people often say numbers digit by digit, much like in English, rather than in blocks of tens or hundreds. For example, '987654321' would be pronounced as 'chín tám bảy sáu năm bốn ba hai một'. This ensures clarity, especially with the subtle tonal differences that can exist between numbers.

Regional variations in pronunciation, particularly between Northern and Southern Vietnamese, can affect how numbers sound. For example, the 'n' sound in năm (five) might be pronounced slightly differently, or the tone of sáu (six) could have a minor variation. However, these are typically minor and do not impede understanding of the numbers themselves. The core system remains the same across regions, making numbers a universally understood aspect of the language.

Related Grammar Points

• như thế nào — How? (Manner/Degree) (Grammar A1)
• em — Younger Person Pronoun (Grammar A1)
• các — Plural Marker (Grammar A1)
• của — Possession (Of) (Grammar A1)
• vâng, dạ, ừ — Saying Yes in Vietnamese (Grammar A1)
• ở — Location Marker (At/In) (Grammar A1)

Practice Tips

Mastering Vietnamese numbers 1-100 is crucial for all A1 level learners and forms the backbone for more advanced counting. Here are some effective practice tips:

• Flashcards: Create flashcards for numbers 1-10, then for 10, 20, 30... 100. Practice recognizing and saying them quickly.
• Count Everyday Objects: Start counting everything around you in Vietnamese. Your fingers, items on a table, steps as you walk. This builds muscle memory and reinforces the patterns.
• Listen and Repeat: Find audio resources (YouTube videos, language apps) that count numbers in Vietnamese. Listen carefully to the pronunciation and tones, then try to imitate them exactly. Pay special attention to mốt and lăm.
• Number Drills: Have a language partner or use an app to quiz you. They say a number in English, you say it in Vietnamese, or vice versa. Focus on rapid recall.
• Practice Phone Numbers and Addresses: Memorize and practice saying your own phone number and address in Vietnamese. Then, try with hypothetical ones. This is a practical skill you'll use frequently.
• Simple Math: Do basic addition and subtraction (within 100) aloud in Vietnamese. For example, "Hai cộng ba bằng năm" (Two plus three equals five).
• NLTV Exam Relevance: For the NLTV A1 exam, you can expect listening comprehension questions that involve identifying numbers, such as prices, times, or quantities. There might also be simple speaking tasks requiring you to state your age or the number of items you have. Understanding this numerical system is a prerequisite for more complex grammar points and will be assessed implicitly and explicitly. Common test patterns include listening to a short dialogue and answering a question about a number mentioned, or filling in the blank with a number in a simple sentence.