概数 Approximate numbers

(1) 用“几”表示概数 Using the character “几” to indicate an approximate number
几 + M + N 他买了几本书 （he bought several books.）
几 + “十/百/万/亿”+M + N
今年语言学院来了几百个留学生。（this year, several hundred overseas students have come to the Language Institute.）
“十” +几 + M + N
前边来了十几个人。 （over ten people are coming towards us.）
这辆车用了二十几万块钱。（this car costs more than two hundred thousand yuan）

(2) 用“多”表示概数 Using the character “多” to indicate an approximate number
A: “多” is placed after a number greater than ten to express the idea of “a few integers more”( a whole number increment, as opposed to a fractional increment). For example:
十/百/万/亿”+ 多 + M + N/A
10 多 本 词典(more than ten dictionaries)
1000 多 岁
8800 多 米 高(more than a thousand years old)
1200 多 年 历史(a history of more than 1200 years)
B: “多“ is placed after a number less than ten or a multi-digit number with a measure word to express the idea of “a fraction more”. For example:
Num + M + 多 （+ N）
两 斤 多 葡萄（more than two jin of grapes）
十四 米 多 白布（a piece of white cloth more than fourteen meters high）
一 个 多 月 （more than a month）
254 块 多 钱 （more than 254 yuan）

(3) Using two adjacent numbers to indicate an approximation. For example, 一两个，二三十，四五百，七八千，八九万，三四十万。