What is smallest number possible using digits 1, 2, 3, 4, 5 only once, one multiply and one division sign anywhere?

Question

How many different positive numbers (integers) can you make using each of the digits 1, 2, 3, 4, once only, and a take away sign?

Example 31-24, or 413-2

Answer 1

[1/(54*32)] = [1/1728] = 0.**********.