分数是由基数词和序数词一起来表示的。基数词作分子，序数词作分母，除了分子是“1”以外，其它情况下序数词都要用复数形式。

1/2 读作a half

1/3 读作one third或a third

1/4 读作one quarter或a quarter

3/4 读作three fourths或 three quarters

1 1/2 读作one and a half

3 1/4 读作three and one fourth或three and one quarter