Number + 倍
倍 (bèi) is a noun meaning 'times' or 'fold,' used to express multiplication or how many times greater something is. For example, 三倍 means 'three times' or 'threefold.' It is essential for comparing quantities and expressing ratios.
他的工资是我的两倍。
Tā de gōngzī shì wǒ de liǎng bèi.
His salary is twice mine.
今年的销量是去年的三倍。
Jīnnián de xiāoliàng shì qùnián de sān bèi.
This year's sales volume is three times last year's.
这个房间的面积比那个大一倍。
Zhège fángjiān de miànjī bǐ nàge dà yī bèi.
The area of this room is twice as large as that one.