Divide top and bottom by any common factors of them.
Dividing by the highest common factor of the top and bottom numbers results in the simplest form.
hcf(12, 15) = 3, so divide top and bottom by 3:
12/15 = (12÷3)/(15÷3)
= 4/5
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It s: 5/15 = 1/3 as a fraction in its lowest reduced terms
15/4 is already in its simplest form.
It is 15/12
12/15 = 4/5.
More info would be nice but if you mean what is the fraction that indicates 12 of 15 it would be 4/5 ? of 15 as 4/5 * 15 = 60/5 or 12 & 5/5 * 15 = 75/5 or 15