Ordinal number refers to the number indicating the order. Ordinal number is a kind of numeral, which is mainly mentioned in English grammar and expressed as "which number" in Chinese. In addition, in birthdays, ordinal numbers are also used when describing one's date of birth. For example: Mayfirst (May 1) and 1 first: 2nd, second and so on.

The so-called cardinal number is mathematically understood as a number with comparable size. Primitive words in English are used to describe the quantity of things. Therefore, the definition of cardinality is: the number describing the number of things is called cardinality.

The form of extended data is as follows:

(1). From1—10 One, two, three, four, five, six, seven, eight, nine, ten. ..

(2) From 1 1—— 19 Eleven, twelve, thirteen, fourteen, five, sixteen, seven, eight and nine.

Except eleven, twelve, thirteen, five and eighteen are special forms, fourteen, sixteen, seventeen and nineteen are all composed of their single-digit forms followed by the suffix -teen.

Resource Ordinal _ Baidu Encyclopedia