155/100 = 31/20 which cannot be simplified further.
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Since the numerator of the fraction is prime, and is not a factor of the denominator, the proper fraction 53/155 is already expressed in simplest form.
155/1000 = 31/200
155/100 = 31/20
155/2
-1.55 = -155/100 = -31/20 = -111/20