小数、分数、百分数、倍数的表示法
Explanation
小数、分数、百分数和倍数是汉语中表达数量的重要方式。小数用'零点几'表示，分数用'几分之几'表示，百分数用'百分之几'表示，倍数用'几倍'表示。
Decimals, fractions, percentages, and multiples are important ways to express quantities in Chinese. Decimals are expressed as '零点几', fractions as '几分之几', percentages as '百分之几', and multiples as '几倍'.
Examples
零点三 三分之二 百分之五十 五倍
0.3, two-thirds, 50%, five times
这一百个汉字，我认识三分之二。
Out of these 100 Chinese characters, I know two-thirds.
这支笔的价格比原来降低了百分之五十。
The price of this pen has decreased by 50% compared to the original price.
三班男生人数是女生人数的三倍。
In Class 3, the number of boys is three times that of girls.
Related Grammar Points
概数表示法3：数词+来+量词HSK 4四61
特殊表达法 · 数的表示法
"数词+来+量词"表示大概的数量，"来"相当于"左右/大约"，表示比该数略多或略少。
"Numeral + 来 + measure word" indicates an approximate quantity, where "来" is equivalent to "about/around", meaning slightly more or less than the stated number.
Examples (1)
十来本 五十来斤 一百来辆
around ten books, about fifty jin, approximately one hundred vehicles