Depends on their age. Anyone under the age of 35 would struggle or look at you blankly and ask what's long division. They would even look at you more blankly if you asked them about fractional adddition, subtraction, multiplication and division.

http://www.bbc.co.uk/schools/gcsebitesize/maths/number/fractions2hirev1.shtml

I really cannot believe the standard of the level of arithmetic (which apparently is now a politically incorrect word), which is being taught at school today, the simple fractions in the above link are for 15 and 16 year olds. Apparently you can get a nationally recognised qualification pass at the age of 16 if the pupil can tell what the time is by knowing where the big hand and the little hand is on the clock.