Is -3.125 rational or irrational

An irrational number can't be expressed in the form of p/q. But here -3.125 can be expressed as -3125/1000(a rational number).

Also a rational number is a real number that canexpressed as terminating or repeating decimals. It is clear that -3.125 is a terminating decimal.

So, -3.125 is a rational number.