No, there is no "bug" in the 86 when you do 6U/3m as opposed to 6E-3/3E-6. You should already know that the first works itself like this: ((6U)/3)*m. Mathematical preference. but 6E-3 and 3E-6 are not broken down into 6*10^(-3) and 3*10^(-6) although that is what they are mathematically equivalent to. When you use E you are telling the calc that "The numbers before this are abbreviated into scientific notation." In other words, 3E-6 are considered one number, merely an abbreviation for .000003. It does not "translate" into 6*10^(-3)/3*10^(-6), which would then take the order of ((6*(10^(-3)))/3)*(10^(-6)), giving you 2E-9. I appologize that this post goes a little lengthy.