42.5 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its rational equivalent is 425/10 which can be simplified, if required.
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How about: "Referring to 425 as a fraction is nonsense because 425 is an integer, not a fraction."
425 is an integer, not a fraction nor a mixed number.
425/1000 = 43%
425/1000 or 17/40
.425 425/1000=81/200