I'm a professor and teach intro economics at a mid-tier university. I would estimate the percentage of students who can multiply 17 by 3 in their heads to be about 15%. I once had a student argue that you can't make a number bigger by dividing it with another number (a decimal below 1) because "that's not how math works". I also teach a (upper level) data analysis class, and a student once asked me "What do you mean by right-click?".
Above all, the tragic part is the apathy. Most students don't even care enough to try and cheat.
Above all, the tragic part is the apathy. Most students don't even care enough to try and cheat.