[Math Lair] Uses of Numbers

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There are three ways in which we use numbers. Numbers are given three names to reflect these uses:

Here is a comparison of the uses of cardinal, ordinal, and tag numbers:
He worked 7 hours.The time is 7 o'clock.He took the route 7 bus.
1920 people attended the game.She was born in 1920.The last four digits of Joe's credit card number are 1920.
The gum costs 89 cents.He lives on 281 Union Street.His phone numbers is 209-8471.

Sources used (see bibliography page for titles corresponding to numbers): 35.