Which fraction is greater than 12?

Any decimal number of the form a.xyz... where a > 12 or a = 12 and xyz... > 0 is a fraction that is greater than 12.

Next, consider the case of rational fractions of the form p/q where q>0.

p/q > 12

Multiplying both sides of the inequality by q gives p > 12*q. So any pair of integers p and q such that q>0 and p>12q will form the rational fraction p/q which is greater than 12.