45 is an integer and since it is larger than 1 it cannot be expressed as a proper fraction.
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Expressed as a proper fraction in its simplest form, 45 percent is equal to 9/20 or nine twentieths.
Expressed as a proper fraction in its simplest form, by dividing the numerator and denominator by 15, 45/150 is equal to 3/10 or three tenths.
0.45 is a proper 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 equivalent, in rational form, is 45/100. You can simplify this rational fraction if you so wish.
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.