So…I can do most two-digit by two-digit multiplication in my head. It’s a binomial expansion, pretty easy. Most people could use a process they learned at some point, FOIL (or some derivative thereof).
But this guy1 takes it to a new level. If you haven’t seen this, watch it. It’s depressing, but it also gets at the relevance thing big time. (Thanks to my aunt and uncle for sending this along.)
