You can avoid the use of commas in a way you can't really avoid addition, though. Heck, my maths teachers do give tips on "easier routes" for questions to save time or reduce the chance of errors.
I suppose I should change it to 'never use division, always use multiplication'.
Both can be done on a calculator with virtually 100% accuracy (at least with no error difference between them). It's not a valid comparison. A more valid one is something like "Don't do a complicated differential equation to try and work out Fx when you can just compare the kinetic energies of an object before and after to find the work done" (yes I managed to screw this one up today). One has more scope for error because it involves more complicated rules. It's clearly
possible to use a comma correctly but I can see why a teacher would tell students not to get embroiled in that mess considering that some exam boards are seriously picky about it. If you feel confident enough in your mastery of commas then just use them, I guess.
I'm probably being retarded and using the wrong word. Stuff like Sincerly, xxxSpidermanxxx or from your royal higness XxSparklyanimevampirqueen666xX really
We all know who you're referring to (Deathworks) so you might as well just tell them if it bothers you so much. Otherwise this seems like going behind someone's back (since Deathworks doesn't usually come to the lower boards).