An integer is equivalent to a fraction with a denominator of 1.
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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.
An improper fraction
The denominator is 10 because 0.1 as a fraction is 1/10