Integers (whole numbers, such as 1, 2, 3, 15, 16, 17, etc.) are also known as "cardinal" numbers. This is to distinguish them from "ordinal" numbers (first, second third, fifteenth, sixteenth etc.
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The main cardinal number for 7 is 7, but 1 is also a cardinal number for 7 in this case.
Cardinal. 5th would the be corresponding ordinal number.A cardinal number.
'Fifth' is the ordinal number of the cardinal number 5.
A number? ^^
the number in the middle