「English also tends to use the plural with decimal fractions, even if less than one, as in 0.3 metres, 0.9 children.」 (维基百科，关键字：plural、linguistics) 由此可知，在十进制分数(俗称小数)中是要用复数(plural、众数[非统计学中特殊名词]) 的，即使小於1，也要使用复数。 「Common fractions less than one tend to be used with singular expressions: half (of) a loaf, two-thirds of a mile.」 (维基百科，关键字：plural、linguistics) 另外，由这句话可知道，在common fractions中，是要用单数的。 「A common fraction (also known as a vulgar fraction or simple fraction) is a rational number written as a/b or , where the integers a and b are called the numerator and the denominator, respectively.[2] The numerator represents a number of equal parts and the denominator, which cannot be zero, indicates how many of those parts make up a unit or a whole. In the examples 2/5 and 7/3, the slanting line is called a solidus or forward slash. In the examples and , the horizontal line is called a vinculum or, informally, a "fraction bar."」 (维基百科，关键字：fraction、mathematics) 上述为common fraction的定义。 「Negative numbers are usually treated the same as the corresponding positive ones: minus one degree, minus two degrees. Again, rules on such matters differ between languages.」 再者，上述为「负数」时，「复数」的使用方法。由此句话可知道，只要对应到其「正数 」的部分，并且由「正数」的部分做为「单数」或「复数」决定之参考。 --

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