Ordinal numbers indicate position in a list, such as first, second, or third. They are formed by adding the suffix -th, -st, -nd, or -rd to the cardinal form of the number. For example, the ordinal forms of one, two, three are first, second, third. Ordinal numbers are used to identify an item's place in a sequence or order.

1. ORDINAL NUMBERS
FUENTE: https://yr3ghajnsielem.wordpress.com/2013/04/07/ordinal-numbers/