As soon as you say "over", you have a fraction.
Just write down what you said. It looks like this:
-4/15
-19
the fraction is 12 over 15:)
4/15= 0.26 reapeating 6
4/15 is the most reduced form of that fraction with integer numerator and denominators.
2 over 7
Expressed as a decimal, 15/4 is equal to 3.75.
The fraction 4/15 cannot be reduced any more.
4/15 = 8/30
15/4 is already in its simplest form.
12/15 = 4/5.
It is: 20/15 = 4/3
4/15