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.
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45/100
Improper fraction is greater than a proper fraction.
proper fraction
45/1000 or 9/200
Proper fraction is part to whole.