It is a figure of speech known as a synechdoche. For example, you might say "wheels" to mean a car or "bread" to represent food of all sorts.
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It is the numerator of a fraction which is above the denominator.
A fraction.
2.45 is a fraction and there is no way to represent it as a whole number. The whole part of it is 2.
A simple fraction represents a part of the whole.
14.2 is a mixed number and there is no way to represent it as a whole number. The whole part of it is 14.