Cardinal, Ordinal, and Nominal Numbers
A 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: