GMAT Quantitative Section | Convert 0.2512(12) to a fraction

Convert 0.2512(12) to a fraction.

Source: GMAT Club Math Book v3 (pg 11)

Firstly, what does the number inside the parenthesis represent? Does it mean the recurrence goes on for 12 times?
Secondly, how I'd approach is :

- Extract the number until its first recurrence, so that'd be 2512.25122512 ...
- Subtract the original recurring number 0.25122512... from 2512.25122512....
- Resultant will be 2512
- Because we moved the decimal four spaces farther during our extract, I will divide 2512 by
...

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