Eighty twelves is nine hundred and sixty.
Ten twelves is 120. 120 is an integer and not a fraction. However, it can be expressed in rational form as 120/1. And that is its simplest form.
5/12 is in its simplest form.
They are equivalent.
3/12 = 1/4
No it is not. 8 and 12 are not coprime: they have a common factor which is greater than 1.
9 twelves = 108 = 10,800%
I suggest you change the fraction to its simplest terms, then multiply numerator and denominator by some number (the same) to get additional forms of the fraction.
Eleven twelves is 132.