Cardinal, Ordinal, and Nominal NumbersA cardinal number tells "how many." Cardinal numbers are also known as "counting numbers," because they show quantity. Here are some examples using cardinal numbers:
Ordinal numbers tell the order of things in a set—first, second, third, etc. Ordinal numbers do not show quantity. They only show rank or position. Here are some examples using ordinal numbers:
A nominal number names something—a telephone number, a player on a team. Nominal numbers do not show quantity or rank. They are used only to identify something. Here are some examples using nominal numbers:

