It NEVER fails. I always start off with the wrong end of the ruler. How can that happen almost every single time defies logic.
Finally, I got fed up with the odds being against me so I took out a marker and colored in a line (1/8Th) at the begining of the number line. The colored side is always on the left hand side and I don't have to fuss.
I did it to all 15 rulers...
Any way I can make things less frustrating means more sewing gets done and fewer things get thrown across the room.