-1.125 = -1 125/1000 = -1 1/8
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1.125 = 1125/1000 = 9/8
112.5 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 1125/10 which can be simplified to 225/2. But simplification will mean that you lose information about the precision of the fraction.
0.04
1125 = 32*53
1125/1000 or 9/8