90
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- 1 90
This is the basic number word for ninety (90).
90
It expresses the number 90, or nine tens.
Learning notes
Explanation
เก้าสิบ is formed from เก้า “nine” and สิบ “ten,” literally representing nine tens. It is written ๙๐ in Thai numerals. When counting objects, the usual pattern is “noun + เก้าสิบ + classifier,” as in หนังสือเก้าสิบเล่ม “ninety books” and นักเรียนเก้าสิบคน “ninety students.” It can be placed directly before units such as บาท “baht” and ปี “year”: เก้าสิบบาท means “90 baht,” and เก้าสิบปี means “90 years.” Adding ที่, as in ที่เก้าสิบ, gives the ordinal meaning “ninetieth” or “number 90.”
Usage
It is used for everyday quantities such as prices, ages, numbers of people or objects, scores, and lengths of time. It also appears in labels and numbers, and with ที่ when indicating the ninetieth item in an order.
Caution
The usual form for 91 is เก้าสิบเอ็ด, not เก้าสิบหนึ่ง. When counting objects, remember that Thai normally requires an appropriate classifier after the number.