Numbers: 0–9999, and 二 or 两
From the lesson “I have two children”
Structure
十一 = 10+1 · 二十 = 2×10 · 二百零八 = 208
汉语中,数字有阿拉伯数字和汉字两种写法,例如“1”和“一”。数字“2”写作、读作“二(èr)”或“两(liǎng)”。一般情况下,在序数词里用“二”,如“第二”;在量词前用“两”。 Numbers are built logically: 十一 (11) is ten-one, 二十 (20) is two-ten, 九十九 is 99. Then 百 (hundred) and 千 (thousand): 一千五百二十八 = 1528. A zero in the middle is read 零: 二百零八 = 208. The number 2 is 二 (èr) when counting and in ordinals (第二), but 两 (liǎng) before a measure word: 两个人, 两口人, 两本书.
Examples
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她有二十个学生。
Tā yǒu èrshí gè xuésheng.
She has twenty students.
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我有两个哥哥。
Wǒ yǒu liǎng gè gēge.
I have two elder brothers.
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一千五百二十八
yìqiān wǔbǎi èrshíbā
1528