Tens, Hundreds, and Positional Lẻ

Vietnamese numbers are built by stating place values in descending order. Once you know the digits, tens use mười/mươi, hundreds use trăm, and a missing tens digit inside a hundred may be announced with lẻ or linh. The system is regular, but the linking word is communicatively important: một trăm lẻ năm is 105, not 150. This page develops tens, hundreds, and the zero-tens position; the forms mốt, tư, and lăm receive their full treatment on Mốt, Tư, and Lăm after Tens.

Build the tens from left to right

Ten is mười. From twenty onward, use digit + mươi and then add the units digit if it is not zero.

The vowel and tone distinguish mười “ten” from mươi, the multiplier used after another digit. They are not interchangeable spellings.

The numeral is built first, and a classifier or directly countable noun follows the complete numeral: hai mươi ba cái ghế, not a classifier inserted between hai mươi and ba.

Add hundreds with trăm

Hundreds follow the pattern digit + trăm. If tens and units follow, say them after the hundreds phrase.

English inserts and in some varieties (“one hundred and twenty-three”). Vietnamese does not use và inside an ordinary cardinal. Place-value words already show the structure.

Lẻ and linh fill an empty tens position

When a number contains hundreds and a nonzero units digit but has zero tens, careful reading inserts a linking form before the final digit:

Linh is especially associated with (regional: Northern) speech, while lẻ is especially associated with (regional: Southern) speech and is widely understood. Both occur in standard number reading. Match the variety and surrounding usage rather than mixing them unpredictably in one carefully read figure.

The linker does not mean English and generally. It specifically signals that the tens position has been skipped. Compare một trăm lẻ năm “105” with một trăm năm mươi “150.”

In fast (informal) speech, speakers may shorten a number when context makes the value obvious. For learning, transactions, measurements, and dictation, the full form with lẻ/linh is safer because it protects the zero tens position.

When not to use lẻ

Do not use lẻ when the number ends at an exact hundred, when a nonzero tens phrase follows, or as a substitute for the decimal marker.

Decimals use phẩy, not positional lẻ: ba phẩy năm is 3.5. “Odd number” and “retail/single units” can also involve lexical lẻ, but those are different meanings from the linking form on this page.

Positional variants: recognize the pattern

Three unit digits need attention after tens:

These variants belong to a pronounced tens environment. After lẻ/linh, use the basic digit: 105 is một trăm lẻ năm, not một trăm lẻ lăm. The next page explains the full distribution, including why 11 is mười một but 21 is hai mươi mốt.

The same numeral inside different constructions

A cardinal's surrounding frame determines its communicative job.

Ordinal thứ, date units ngày/tháng, and time unit giờ do grammatical work that bare digits cannot. Likewise, hai trăm lẻ năm nghìn đồng is a money amount because nghìn đồng supplies scale and currency. Duration uses a time unit, as in một trăm lẻ năm phút “105 minutes.” Calendrical cycles can use the same cardinals with ngày, tháng, and năm.

A natural checkout correction

The contrast rests on place value: lẻ năm fills an empty tens slot and gives 105, while năm mươi explicitly gives five tens and therefore 150. In payment, addresses, and room numbers, that small word can prevent a consequential misunderstanding.

Common Mistakes

1. Using mười after a multiplier

After hai through chín, use mươi.

2. Omitting the zero-tens linker in careful reading

The full form protects the place-value structure. In (regional: Northern) usage, một trăm linh năm is equally systematic.

3. Copying English and inside the cardinal

Và coordinates phrases; it is not the ordinary number linker.

4. Using lăm after lẻ

With no pronounced tens, the basic digit năm returns.

5. Putting the classifier inside the numeral

Build hai mươi ba first; then attach cái ghế.

Key Takeaways

• Ten is mười; multiples from twenty onward use digit + mươi.
• Hundreds use digit + trăm, followed by tens and units from left to right.
• Lẻ or linh announces an empty tens position between a hundred and a final units digit.
• Positional mốt, tư, and lăm depend on a tens environment; after lẻ/linh, use the basic digit.
• Build the whole cardinal before adding a classifier, noun, currency, date unit, or time unit.