Olfactorithmetic
The ability to glance at a document and announce "This number smells wrong". It is not necessarily correlated with the ability to show workings as to why it's wrong. Those who have cultivated olfactorithmetic abilities may need to ask a colleague to calculate, but often the numbers their noses identify turn out to stink."
THE BBC, Mike Moore observes, isn’t universally blessed with the ability to detect numbers that smell wrong, or olfactorithmetic.