That's a good question, all you need to do is just put a negative sign before the fraction. So in this case, it would be 37 over 1 with negative sign before it.
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37/100
-1/4
-4/1
Expressed as a decimal fraction, 13/37 is equal to 0.351 recurring (that is, 0.351351351..)
37% = 37/100 as a fraction in its simplest form