You can 
put this solution on YOUR website! .
1/12 is here
  ----|--|----------------------|----
      0  1/12                   1
Now you make 2/56 in the same way.
Another way to get 1/12 on a number line is THIS:
            take an inch ruler/(straightedge) and note first inch mark in the first foot interval.
            1 inch = 1/12 of a foot.