15
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- 1 15
This is the basic numeral for the number fifteen (15).
15
It expresses the number 15 in quantities, ages, dates, times, and other numerical expressions.
Learning notes
Explanation
สิบห้า is formed from สิบ “ten” and ห้า “five” and means “fifteen.” When counting objects, the usual pattern is “noun + สิบห้า + classifier.” For example, หนังสือสิบห้าเล่ม means “fifteen books.” With ages, durations, prices, and other measurements, a unit such as ปี “year,” นาที “minute,” or บาท “baht” follows the numeral. It is a neutral, everyday number used in both speech and writing.
Usage
It is used when giving quantities, numbers of people, ages, prices, and durations. วันที่สิบห้า means “the fifteenth day of the month,” while สิบห้านาฬิกา means “15:00” in formal time-telling.
Caution
สิบห้า by itself is the cardinal number “fifteen.” To express the ordinal “fifteenth,” use ที่สิบห้า. When counting objects, the appropriate classifier normally comes after the number.