Answer:
1/100
Step-by-step explanation:
The second 5 has a value of 5 (units). The first 5 has a value of 5 hundreds, or 500. The fraction you're looking for is then ...
... 5/500 = 1/100
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Comment on place value
Each place has a value 10 times that of the place to its right. Looking at it from the other direction, each place has a value 1/10 that of the place to its left. Then the 5 in the units place will have a value 1/10·1/10 = 1/100 that of the 5 that is 2 places to its left.