You do nothing! 12.03 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 1203/100 which cannot be simplified.
12.03 as an improper fraction is 1203/100
12.03 = 1203/100
Expressed as a proper fraction in its simplest form, -0.1203 is equal to -1203/10000 or negative one thousand two hundred and three ten thousandths.
The positive integer factors of 1203 are: 1, 3, 401, 1203
1203 = MCCIII
The answer depends on what you want to turn into a fraction. And, incidentally, I do not turn into a fraction.
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When you turn a fraction over you get a reciprocal.
you can't turn a reminder in to a fraction