几十、几百的、几千的1～3序数均是按照数字加st，nd，rd的方式；其它均是数字+th；st是first的缩写，nd是second的缩写，rd是third的缩写。

A Cardinal Number is a number that says how many of something there are, such as one, two, three, four, five. An Ordinal Number is a number that tells the position of something in a list, such as 1st, 2nd, 3rd, 4th, 5th etc. Most ordinal numbers end in "th" except when the final word is:

third（第三） 英文的序數還有縮寫的寫法，只要在阿拉伯數字後面加上序數的最後兩個字即可。 例如：first = 1st , second = 2nd, third = 3rd。 再來是規則的序數，好消息是從從第四開始，一直到第十九，基本上就是在基數字尾加上 th，例如：fourth / 4th、sixth / 6th 等等。

英文序數縮寫 用數字+最後兩個字母，1st、2nd、3rd，注意第11的縮寫是11th，不是11st; 若基數與序數同時出現時，先說序數再說基數，例如：The first three students will receive scholarships.(前三名的學生可以獲得獎學金) 序數對照表. 英文序數寫法是

1st、2nd、3rd 这些是数字first、second、third的缩写，在书写文字日期的时候便于整体美观简便而使用到。 1st january原文first january意思是一月一号。 规律是：日期数字+英文单词的最后两个字母+月份。

1～3分別加上st, nd, rd。 On the twelfth day of Christmas, some people like to eat a king cake. 在聖誕節過後的第 12 天，有些人喜歡吃國王餅。 👇 快來發摟A+粉專 英文學習不間斷！ 👇 給習慣 …

2011年8月30日 · first (1st) 、second (2nd) 、third (3rd) ，这类序数词只有三个，在整个序数词里面是特殊的，就和第一类基数词一样，需要逐个地硬记下来。 2、基数词后面加后缀-th. 这一类序数词共有十六个。均在相应的基数词后面加上后缀－th构成。

2020年4月30日 · 3 – third (3rd) 從上表可知道1″st”才是正確的，是從first縮寫而成，所以不使用1th 而是使用1st。21, 31, 41..後面尾數是1的，序數縮寫都需要改成”st”, e.g., 21st , 31st, 41st and so on.

其中1st，2nd，3rd为特殊形式，其它的都是阿拉伯数字后加th。 表分数：分子用基数词，分母用序数词，中间用连字符，若分子大于一，分母用复数形式。

In this lesson, we're looking at the spelling of ordinal numbers and a few rules. 1st = first (She won first prize.) 2nd = second (I live on the 2nd floor.) 3rd = third (Take the third turning on the left.) 4th = fourth (It's his fourth birthday.) 5th = fifth (This is the 5th time I've taken my driving test.)