I know too many engineers who can't do arithmetic in their heads to think this has more significance that something Dan Quayle or Obama might have messed up.
I can do that kind of thing in my head rapidly, but I'm the third generation of a family of accountants.
Biden's blatant steal of the White and the re-imposition of the criminal Obama regime is the identifying mark of the Jo-Ho Gang. His being senile is incidental to the crime.