I can think of three:
8/1 could be "eight ones"
62/1 could be "sixty two over one"
or given that it represents a whole number: 4/1 could be "four"
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is said to be in its simplest form.
An integer is equivalent to a fraction with a denominator of 1.
4 is an integer and so has denominator 1. 0.7 is a proper fraction and cannot have a denominator of 1.
455 is not a fraction but an integer. It may be written as 455/1 in which case the denominator is 1.
If the denominator is positive and the numerator is less than the denominator then the fraction is less than 1. If the denominator is positive and the numerator is greater than the denominator then the fraction is greater than 1.