153298

5.11<5.23
5.11<5.32
5.12<5.13
5.12<5.31
5.13>5.12
5.13<5.21
5.21>5.13
5.21<5.31
5.23>5.11
5.31>5.12
5.31>5.21
5.32>5.11

We worked systematically starting at 5.11 which is the lowest possible number we could make using the digits. After this, we worked out every possibility with 5.11 at the beginning before moving onto the next largest starting number which was 5.12. Next we continued this all the way up to 5.32 which is the highest combination. We also included reverses in our final answer. Our result was 12 possibilities. During the process, we ensured ourselves we hadn’t used numbers twice or used the same combination.