30.48 = 30 48/100
Now to make this into simplest form you need to find a number that goes into both 48 and 100 evenly
We will use 4 to start with
48 / 4 = 12
100 / 4 = 25
No other number can go into both 12 and 25 evenly so we know that it's as simple as it gets
Answer: 30 12/25