Explanation:
1 : 12 = 0
since we exhausted the given digits with that, the answer is 0.xxxxx...
to find the digits after the decimal point : pulling down the next digit towards 1, but there is none, so pulling a 0 :
10 : 12 = 0
pulling down the next digit (0) :
100 : 12 = 8
8×12 = 96, so subtracting 96 from 100 (4) and pulling down the next digit (0) :
40 : 12 = 3
3×12 = 36, so subtracting 36 from 40 (4) and pulling down the next digit (0) ;
40 : 12 = 3
3×12 = 36, so subtracting 36 from 40 (4) and pulling down the next digit (0) ;
40 : 12 = 3
as we can see, from here on we will be in an endless loop creating 3s.
so, collecting the individual result digits we get
1/12 = 0.083333...