i led the math team to the first win in decades in hs on this team 100 question math test and i was a top dork for math questions on academic team as well. i used to be able to do some cool stuff in my head (although not to the point of these speed tricks and knowing all the math tricks this guy is doing.)
now my brain sucks for this stuff. no exercise, no skillz, lazy brain
i had an informal math rivalry with this guy isaac from grayslake who i think had a bit of a stutter. we were on the same floor fresh year at uiuc but even then we never talked, even though our roomates actually did a few times... to this day i don't know if one of us was better than the other, i know he won the individual math competition '20 question test' though. i did not take it during the competition. our valedictorian took it and got 6 right. i got 12 but took it in class and not the competition. to this day i still want to know what isaac got. i'd score a 0 today for sure though.