Large Numbers Group By Three

Here is how the large number multipliers work. Note that while the leading một (one) is standard, in spoken Vietnamese it is frequently dropped before trăm, ngàn, and triệu (e.g., saying ngàn hai trăm instead of một ngàn hai trăm):

• 100: một trăm
• 1.000: một nghìn (North) or một ngàn (South)
• 10.000: mười nghìn (North) or mười ngàn (South)
• 100.000: một trăm nghìn (North) or một trăm ngàn (South)
• 1.000.000: một triệu
• 1.000.000.000: một tỷ (or tỉ)

Zero Placeholders:
In formal or standard Vietnamese, if a large number has internal zeros, you must say them out loud:

• Zero in the hundreds place: không trăm (zero hundred)
• Zero in the tens place: linh (North) or lẻ (South)

For example, 2.005 is read as hai nghìn không trăm linh năm (two thousand zero hundred and five), and 2.025 is hai nghìn không trăm hai mươi lăm. Note: In casual speech, locals sometimes shorten years like 2025 to 'hai ngàn hai lăm' (dropping both 'không trăm' and 'mươi'), but for prices or quantities, the full form is usually kept to avoid ambiguity.

Digit Shifts:
Remember that standard number shifts apply here too, but they depend on whether the number is in the teens (using mười) or 20 and above (using mươi). These shifts remain even if the word mươi is dropped in casual speech:

• 1 becomes mốt for 21 and above (e.g., 21 is hai mươi mốt or just hai mốt). 11 is still mười một.
• 4 can become tư for 24 and above (e.g., 24 is hai mươi tư or hai tư), though bốn is also perfectly grammatical. 14 is standardly mười bốn, but mười tư is sometimes used in specific contexts like lunar dates or in certain regional dialects.
• 5 becomes lăm for 15 and above (15, 25, etc.). Note: In Northern dialects, 5 is also commonly pronounced as nhăm for 25 and above (e.g., 25 as hai mươi nhăm).

If the tens place is a zero (linh or lẻ), the numbers revert to their base forms. For example, 101 is một trăm linh một, and 105 is một trăm linh năm.

Dropping "mươi" and Using "chục":
In spoken Vietnamese, the word mươi is frequently dropped for numbers 21-99. For example, 24 becomes hai tư, and 35 becomes ba lăm. Additionally, locals frequently replace mươi with chục for tens in large numbers (e.g., 120,000 is very commonly spoken as một trăm hai chục ngàn).

Trailing Digit Shortcut:
In daily commerce, Vietnamese speakers frequently drop the final unit name when stating a mixed large number. The trailing digit always refers to the next immediate descending unit. For example, 1,200 is commonly said as một ngàn hai (one thousand two [hundred]), and 120,000 can be said as một trăm hai (one hundred two [ten-thousands]). Without knowing this, learners might mistakenly think một ngàn hai means 1,002. To actually say 1,020, you must use zero placeholders: một ngàn không trăm hai mươi. Additionally, when talking about prices, the word for 'thousand' (nghìn/ngàn) is often dropped entirely. For instance, 50,000 VND is simply spoken as năm mươi.

Using "rưỡi" (and a half):
For large numbers ending in a 5-value of the next lowest tier, you can use rưỡi. For example, 1.500 is một ngàn rưỡi (one thousand and a half), and 2.500.000 is hai triệu rưỡi.

Note: Unlike Mandarin or Japanese, modern Vietnamese generally does not group numbers by 10,000 (vạn) for everyday counting. 10,000 is usually mười nghìn (ten thousand). However, vạn is still used in specific modern contexts, such as measuring car mileage or expressing very large, indefinite quantities.