#1**+2 **

The fraction will not repeat if we can make a reduced fraction with only some power of "2" in the denominator

So

1/12 = repeats

2/12 = 1/6 = repeats

3/12 = 1/4 = 1/2^2 = terminates

4/12 = 1/3 = repeats

5/12 = repeats

6/12 = 1/2 = terminates

7/12 = repeats

8/12 = 2/3 = repeats

9/12 = 3/4 = 3/2^2 = terminates

10/12 = 5/6 = repeats

11/12 = repeats

CPhill Feb 19, 2019