ok so, to find a fraction equivalent, of say example$\displaystyle 0.123 123 123$

we put$\displaystyle s = 0.123 123 123$therefore the repeating group is 123 and is 3 digits long so we multiply$\displaystyle s $by $\displaystyle 10^3$ ...

$\displaystyle

1000s = 123. 123 123 123 123 ... = 123 + s$

hence you get

$\displaystyle s = \frac {123}{999} = \frac{41}{333}$

So on that basis, how could you do the same for say, 0.985 498 549 854....

thanks