-4.5 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. And, since it is a decimal fraction, there is not another simpler decimal form. Its equivalent, in rational form, is -45/10. You can simplify this rational fraction if you so wish.
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The answer depends on what fraction of WHAT?
There will be no answer because 45 is an integer, not a fraction and so there is no fraction to decompose.
45% = 45/100 in fraction
45% = 9/20 as a fraction in its lowest terms
It is 45/1440.