The Wikipedia article on long division explains the different notations. I still use the European notation I learned in elementary school in Colombia. I had difficulty adapting to the US/UK notation when I moved to the US. However, I did enjoy seeing my classmates' puzzled faces in college whenever we had a professor that preferred the European notation.
What long division notation do you use and where did you learn it?
I use the same one that is used in the U.S.; it is the one that is (or at least, was up until the 80s) taught in Mexico. I had some classmates in high school who had emigrated form Argentina: they used the one described in the Wikipedia article as "European", not the one described as "Latin America". (I'll also note that beginners in Mexico would write the full computation as described in "US notation"; doing the computation mentally was more an 'advanced shortcut' than part of the notation, as I remember).